#include <algorithm>
#include <cinttypes>
#include <cmath>
#include <cstdlib>
#include <cstdio>
#include <cstdint>
#include <deque>
#include <initializer_list>
#include <map>
#include <queue>
#include <set>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <vector>

using std::deque;
using std::initializer_list;
using std::make_pair;
using std::map;
using std::multiset;
using std::pair;
using std::priority_queue;
using std::reverse;
using std::set;
using std::sort;
using std::string;
using std::swap;
using std::unordered_map;
using std::unordered_set;
using std::vector;

typedef int8_t     int8;
typedef int16_t    int16;
typedef int32_t    int32;
typedef int64_t    int64;
typedef __int128_t int128;

template <typename T>
using priority_queue_max = std::priority_queue<T>;

template <typename T>
using priority_queue_min = std::priority_queue<T, std::vector<T>, std::greater<T>>;

const int32 oo = 1e9;
const int64 ooo = 1e18;

#define scan(args...) [&]{ return scanf(args); }();
#define elements(a) ((int32)(a).size())
#define TESTS  int32 _t; scan("%" SCNd32, &_t); while (_t--)

inline int64 castformorebits(int32 a)
{
    return (int64)a;
}

inline int128 castformorebits(int64 a)
{
    return (int128)a;
}

template <class INT>
inline INT abs(INT a)
{
    if (a >= 0) return a;
    return -a;
}

template <typename T>
T minimum(std::initializer_list<T>&& l)
{
    T answer = *(l.begin());

    for (auto a : l)
        if (a < answer)
            answer = a;

    return answer;
}

template <typename T>
T minimum(const vector<T>& l)
{
    T answer = *(l.begin());

    for (auto a : l)
        if (a < answer)
            answer = a;

    return answer;
}

template <typename T>
T maximum(std::initializer_list<T>&& l)
{
    T answer = *(l.begin());

    for (auto a : l)
        if (a > answer)
            answer = a;

    return answer;
}

template <typename T>
T maximum(const vector<T>& l)
{
    T answer = *(l.begin());

    for (auto a : l)
        if (a > answer)
            answer = a;

    return answer;
}

template <typename T>
inline void sort(T &data)
{
    sort(data.begin(), data.end());
}

template <typename T>
inline void reverse(T &data)
{
    reverse(data.begin(), data.end());
}

template <class INT>
inline bool is_power_of_2(INT num)
{
    return num && !(num & (num - 1));
}

template <class INT>
inline INT rightmost_bit(INT num)
{
    return num & -num;
}

template <class INT>
inline INT leftmost_bit(INT num)
{
    while (!is_power_of_2(num))
        num -= rightmost_bit(num);
    return num;
}

template <class INT>
inline bool is_set(INT mask, int pos)
{
    return (mask & (INT(1) << pos));
}

template <class INT>
inline INT mask_set(INT mask, int pos)
{
    return mask | (INT(1) << pos);
}

template <class INT>
inline INT mask_unset(INT mask, int pos)
{
    return mask & (~(INT(1) << pos));
}

inline int32 log_bit(int32 l)
{
    static int32 ctz_precalc[1<<16];

    if (ctz_precalc[2] == 0)
        for (int32 i = 2; i < (1 << 16); i++)
            ctz_precalc[i] = ctz_precalc[i/2] + 1;

    int32 offset = 0;
    if ((l & 0x0000ffff) != 0)
    {
        offset += 16;
        l = l >> 16;
    }
    return ctz_precalc[l] + offset;
}

inline int32 log_bit(int64 l)
{
    static int32 ctz_precalc[1<<16];

    if (ctz_precalc[2] == 0)
        for (int32 i = 2; i < (1 << 16); i++)
            ctz_precalc[i] = ctz_precalc[i/2] + 1;

    int32 offset = 0;
    if ((l & 0x00000000ffffffffLL) != 0)
    {
        offset += 32;
        l = l >> 32;
    }
    if ((l & 0x0000ffffLL) != 0)
    {
        offset += 16;
        l = l >> 16;
    }
    return ctz_precalc[l] + offset;
}

inline int count_bits(int64 x)
{
    static int32 popcount_precalc[1<<16];

    if (popcount_precalc[1] == 0)
    {
        popcount_precalc[1] = 1;
        for (int32 i = 2; i < (1 << 16); i++)
            popcount_precalc[i] = popcount_precalc[i/2] + (i & 1);
    }

    return popcount_precalc[x & 0xffff]
         + popcount_precalc[(x >> 16) & 0xffff]
         + popcount_precalc[(x >> 32) & 0xffff]
         + popcount_precalc[(x >> 48) & 0xffff];
}


inline void read(int32& val)
{
    scan("%" SCNd32, &val);
}

inline void read(int64& val)
{
    scan("%" SCNd64, &val);
}

inline void read(double& val)
{
    scan("%lf", &val);
}

inline void read(string& val, int length = 1e6)
{
    char tmp[length+1];

    scan("%s", tmp);

    val = tmp;
}

template <class S, class T>
inline void read(S& a, T& b)
{
    read(a);
    read(b);
}

template <class S>
inline void read(vector<S> &v, int n)
{
    v.resize(n);
    for (int i = 0; i < n; i++)
        read(v[i]);
}

template <class S, class T, class U>
inline void read(S& a, T& b, U& c)
{
    read(a);
    read(b);
    read(c);
}

template <class S, class T, class U, class V>
inline void read(S& a, T& b, U& c, V& d)
{
    read(a);
    read(b);
    read(c);
    read(d);
}

template <class S, class T, class U, class V, class W>
inline void read(S& a, T& b, U& c, V& d, W& e)
{
    read(a);
    read(b);
    read(c);
    read(d);
    read(e);
}

inline void write(int32 val)
{
    printf("%" PRId32 " ", val);
}

inline void write(int64 val)
{
    printf("%" PRId64 " ", val);
}

inline void write(double val)
{
    printf("%lf ", val);
}

inline void write(const string& val)
{
    printf("%s ", val.c_str());
}

template<class S>
inline void write(const vector<S>& val)
{
    for (S el : val)
        write(el);
}

template<class S>
inline void writeln(const S& a)
{
    write(a);
    printf("\n");
}

template<class S, class T>
inline void writeln(const S& a, const T& b)
{
    write(a);
    write(b);
    printf("\n");
}

template<class S, class T, class U>
inline void writeln(const S& a, const T& b, const U& c)
{
    write(a);
    write(b);
    write(c);
    printf("\n");
}

template<class S, class T, class U, class V>
inline void writeln(const S& a, const T& b, const U& c, const V& d)
{
    write(a);
    write(b);
    write(c);
    write(d);
    printf("\n");
}

template<class S, class T, class U, class V, class W>
inline void writeln(const S& a, const T& b, const U& c, const V& d, const W& e)
{
    write(a);
    write(b);
    write(c);
    write(d);
    write(e);
    printf("\n");
}

#ifdef PCL_DEBUG
    #define DBG_RED "\033[1;31m"
    #define DBG_YELLOW "\033[1;33m"
    #define DBG_BLUE "\033[1;34m"
    #define DBG_NC "\033[0m"

    #define debug(var) { printf("%s%s%s = ", DBG_RED, #var, DBG_NC); writeln(var); }
    #define break_point(str) { printf("%s%s%s\n", DBG_YELLOW, str, DBG_NC); }
#else
    #define debug(...)
    #define break_point(...)
#endif

#include <random>

vector<std::tuple<int32, int32, int64, int32>> v;

struct pair_hash
{
    std::size_t operator()(const std::pair<int32, int32> &pair) const
    {
        return std::hash<int>()(pair.first) ^ std::hash<int>()(pair.second);
    }
};

void dfs(vector<unordered_map<int32, int32>> &graph, vector<int32> &colors, int32 vi, int32 parent, int64 dist, int32 color)
{
    if (dist < 0)
        return;

    colors[vi] = color;

    for (auto [vj, w] : graph[vi])
    {
        if (vj != parent)
            dfs(graph, colors, vj, vi, dist - w, color);
    }
}

void brute_force(int n)
{
    vector<unordered_map<int32, int32>> graph(n);
    vector<int32> colors(n);

    for (auto [op, a, b, w] : v)
    {
        if (op == 1)
        {
            graph[a][b] = w;
            graph[b][a] = w;
        }
        else if (op == 2)
        {
            graph[a].erase(b);
            graph[b].erase(a);
        }
        else if (op == 3)
        {
            dfs(graph, colors, a, -1, b, w);
        }
        else if (op == 4)
        {
            int32 vi = a;

            writeln(colors[vi]);
        }
    }
}

pair<int32, pair<int32, int32>> root(int32 vi, vector<int32> &parent, vector<pair<int32,int32>> &color)
{
    if (parent[vi] == -1)
        return {vi, color[vi]};

    auto [root_vi, color_vi] = root(parent[vi], parent, color);
    if (color_vi.second < color[vi].second)
        color_vi = color[vi];

    return {root_vi, color[vi]};
}

void cale_drzewo(int n)
{
    vector<int32> parent(n, -1);
    vector<pair<int32,int32>> color(n, {0, 0});
    vector<int32> Size(n, 1);
    unordered_map<pair<int32,int32>, int32, pair_hash> edges;

    int32 timer = 1;

    for (auto [op, a, b, w] : v)
    {
        if (op == 1)
        {
            auto [root_a, color_a] = root(a, parent, color);
            auto [root_b, color_b] = root(b, parent, color);

            if (Size[root_a] < Size[root_b])
                swap(root_a, root_b);

            parent[root_b] = root_a;
            Size[root_a] += Size[root_b];
            edges[{a, b}] = root_b;
            edges[{b, a}] = root_b;
        }
        else if (op == 2)
        {
            int32 e = edges[{a, b}];

            auto [root_e, color_e] = root(e, parent, color);

            Size[root_e] -= Size[e];
            parent[root_e] = -1;
            color[root_e] = color_e;

            edges.erase({a, b});
            edges.erase({b, a});
        }
        else if (op == 3)
        {
            auto [root_a, color_a] = root(a, parent, color);

            color[root_a] = {timer, w};
        }
        else if (op == 4)
        {
            int32 vi = a;

            auto [root_vi, color_vi] = root(vi, parent, color);
            writeln(color_vi.second);
        }

        timer++;
    }
}

void distances(int32 vi, int32 parent, int64 d, vector<vector<pair<int32, int32>>> &graph, vector<int64> &dists)
{
    dists[vi] = d;

    for (auto [vj, w] : graph[vi])
    {
        if (vj != parent)
            distances(vj, vi, d + w, graph, dists);
    }
}


void dfs(vector<vector<pair<int32, int32>>> &graph, vector<pair<int32, int32>> &colors, int32 vi, int32 parent, int64 dist, int32 color, int32 timestamp)
{
    if (dist < 0)
        return;

    colors[vi] = { color, timestamp };

    for (auto [vj, w] : graph[vi])
    {
        if (vj != parent)
            dfs(graph, colors, vj, vi, dist - w, color, timestamp);
    }
}

void jedno_drzewo(int n)
{
    vector<vector<pair<int32, int32>>> graph(n);
    vector<pair<int32, int32>> colors(n, {0, 0});

    vector<vector<int32>> binary_leap(n, vector<int32>(log_bit(n) + 1, -1));
    vector<vector<int64>> dists_leap(n, vector<int64>(log_bit(n) + 1, int64(1e15)));

    for (int i = 0; i < n-1; i++)
    {
        int32 z, a, b, w;

        std::tie(z, a, b, w) = v[i];
        graph[a].push_back({b, w});
        graph[b].push_back({a, w});
    }

    // Calculating binary_leap as root = 0
    vector<int32> parent(n, -1);
    vector<int32> depth(n, 0);
    vector<int32> stack = {0};

    while (not stack.empty())
    {
        int32 vi = stack.back();
        stack.pop_back();

        for (auto [vj, w] : graph[vi])
        {
            if (vj != parent[vi])
            {
                parent[vj] = vi;
                depth[vj] = depth[vi] + 1;
                binary_leap[vj][0] = vi;
                dists_leap[vj][0] = w;
                stack.push_back(vj);
            }
        }
    }

    for (int j = 1; j < log_bit(n) + 1; j++)
    {
        for (int i = 0; i < n; i++)
        {
            if (binary_leap[i][j-1] != -1)
            {
                binary_leap[i][j] = binary_leap[binary_leap[i][j-1]][j-1];
                dists_leap[i][j] = dists_leap[i][j-1] + dists_leap[binary_leap[i][j-1]][j-1];
            }
        }
    }

    std::mt19937 rng(std::random_device{}());
    int random_node = std::uniform_int_distribution<int>(0, n-1)(rng);
    vector<int64> dists(n, int64(1e15));

    distances(random_node, -1, 0, graph, dists);

    sort(dists);

    int sqrt_dist = dists[minimum({500, n-1})];
    vector<std::tuple<int32, int64, int32, int32>> last_coloring;

    for (int i = n; i < v.size(); i++)
    {
        auto [op, a, b, w] = v[i];

        if (op == 3)
        {
            int32 color = w;

            if (b <= sqrt_dist)
            {
                dfs(graph, colors, a, -1, b, color, i);
            }
            else
            {
                last_coloring.push_back({a, b, color, i});
            }
        }
        else if (op == 4)
        {
            auto [c, timestamp] = colors[a];
            int j = last_coloring.size() - 1;

            while (j >= 0 and std::get<3>(last_coloring[j]) > timestamp)
            {
                auto [vi, z, color, timestamp] = last_coloring[j];
                
                // Calculating distance beatween a and vi using binary leap

                int32 da = a;
                int32 db = vi;
                int64 dist = 0;

                if (depth[da] < depth[db])
                    swap(da, db);
                
                for (int j = log_bit(n); j >= 0; j--)
                {
                    if (depth[da] - depth[db] >= (1 << j))
                    {
                        dist += dists_leap[da][j];
                        da = binary_leap[da][j];
                    }
                }

                if (da != db)
                {
                    for (int j = log_bit(n); j >= 0; j--)
                    {
                        if (binary_leap[da][j] != -1 and binary_leap[da][j] != binary_leap[db][j])
                        {
                            dist += dists_leap[da][j] + dists_leap[db][j];
                            da = binary_leap[da][j];
                            db = binary_leap[db][j];
                        }
                    }

                    dist += dists_leap[da][0] + dists_leap[db][0];
                }

                if (dist <= z)
                {
                    c = color;
                    break;
                }
            }

            writeln(c);
        }
    }
}

int main()
{
    int n, m, q;

    read(n, m, q);

    v.resize(m + q);
    for (int i = 0; i < m; i++)
    {
        int32 a, b, w;

        read(a, b, w);
        a--;
        b--;
        v[i] = {1, a, b, w};
    }

    for (int i = 0; i < q; i++)
    {
        int32 op;

        read(op);

        if (op == 1)
        {
            int32 a, b, w;

            read(a, b, w);
            a--;
            b--;
            v[m + i] = {1, a, b, w};
        }
        else if (op == 2)
        {
            int32 a, b;

            read(a, b);
            a--;
            b--;
            v[m + i] = {2, a, b, 0};
        }
        else if (op == 3)
        {
            int32 vi, k;
            int64 z;

            read(vi, z, k);
            vi--;
            v[m + i] = {3, vi, z, k};
        }
        else if (op == 4)
        {
            int32 vi;

            read(vi);
            vi--;
            v[m + i] = {4, vi, 0, 0};
        }
    }

    // Rozpoznajemy przypadek
    bool przypadek_1 = (n - 1 == m);
    bool przypadek_2 = true;

    for (int i = 0; i < q; i++)
    {
        if (std::get<0>(v[m + i]) == 1 or std::get<0>(v[m + i]) == 2)
            przypadek_1 = false;
        if (std::get<0>(v[m + i]) == 3 or std::get<2>(v[m + i]) != int64(1e15))
            przypadek_2 = false;
    }

    if (przypadek_1)
        jedno_drzewo(n);
    else if (przypadek_2)
        cale_drzewo(n);
    else
        brute_force(n);

    return 0;
}

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#include <algorithm>
#include <cinttypes>
#include <cmath>
#include <cstdlib>
#include <cstdio>
#include <cstdint>
#include <deque>
#include <initializer_list>
#include <map>
#include <queue>
#include <set>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <vector>

using std::deque;
using std::initializer_list;
using std::make_pair;
using std::map;
using std::multiset;
using std::pair;
using std::priority_queue;
using std::reverse;
using std::set;
using std::sort;
using std::string;
using std::swap;
using std::unordered_map;
using std::unordered_set;
using std::vector;

typedef int8_t     int8;
typedef int16_t    int16;
typedef int32_t    int32;
typedef int64_t    int64;
typedef __int128_t int128;

template <typename T>
using priority_queue_max = std::priority_queue<T>;

template <typename T>
using priority_queue_min = std::priority_queue<T, std::vector<T>, std::greater<T>>;

const int32 oo = 1e9;
const int64 ooo = 1e18;

#define scan(args...) [&]{ return scanf(args); }();
#define elements(a) ((int32)(a).size())
#define TESTS  int32 _t; scan("%" SCNd32, &_t); while (_t--)

inline int64 castformorebits(int32 a)
{
    return (int64)a;
}

inline int128 castformorebits(int64 a)
{
    return (int128)a;
}

template <class INT>
inline INT abs(INT a)
{
    if (a >= 0) return a;
    return -a;
}

template <typename T>
T minimum(std::initializer_list<T>&& l)
{
    T answer = *(l.begin());

    for (auto a : l)
        if (a < answer)
            answer = a;

    return answer;
}

template <typename T>
T minimum(const vector<T>& l)
{
    T answer = *(l.begin());

    for (auto a : l)
        if (a < answer)
            answer = a;

    return answer;
}

template <typename T>
T maximum(std::initializer_list<T>&& l)
{
    T answer = *(l.begin());

    for (auto a : l)
        if (a > answer)
            answer = a;

    return answer;
}

template <typename T>
T maximum(const vector<T>& l)
{
    T answer = *(l.begin());

    for (auto a : l)
        if (a > answer)
            answer = a;

    return answer;
}

template <typename T>
inline void sort(T &data)
{
    sort(data.begin(), data.end());
}

template <typename T>
inline void reverse(T &data)
{
    reverse(data.begin(), data.end());
}

template <class INT>
inline bool is_power_of_2(INT num)
{
    return num && !(num & (num - 1));
}

template <class INT>
inline INT rightmost_bit(INT num)
{
    return num & -num;
}

template <class INT>
inline INT leftmost_bit(INT num)
{
    while (!is_power_of_2(num))
        num -= rightmost_bit(num);
    return num;
}

template <class INT>
inline bool is_set(INT mask, int pos)
{
    return (mask & (INT(1) << pos));
}

template <class INT>
inline INT mask_set(INT mask, int pos)
{
    return mask | (INT(1) << pos);
}

template <class INT>
inline INT mask_unset(INT mask, int pos)
{
    return mask & (~(INT(1) << pos));
}

inline int32 log_bit(int32 l)
{
    static int32 ctz_precalc[1<<16];

    if (ctz_precalc[2] == 0)
        for (int32 i = 2; i < (1 << 16); i++)
            ctz_precalc[i] = ctz_precalc[i/2] + 1;

    int32 offset = 0;
    if ((l & 0x0000ffff) != 0)
    {
        offset += 16;
        l = l >> 16;
    }
    return ctz_precalc[l] + offset;
}

inline int32 log_bit(int64 l)
{
    static int32 ctz_precalc[1<<16];

    if (ctz_precalc[2] == 0)
        for (int32 i = 2; i < (1 << 16); i++)
            ctz_precalc[i] = ctz_precalc[i/2] + 1;

    int32 offset = 0;
    if ((l & 0x00000000ffffffffLL) != 0)
    {
        offset += 32;
        l = l >> 32;
    }
    if ((l & 0x0000ffffLL) != 0)
    {
        offset += 16;
        l = l >> 16;
    }
    return ctz_precalc[l] + offset;
}

inline int count_bits(int64 x)
{
    static int32 popcount_precalc[1<<16];

    if (popcount_precalc[1] == 0)
    {
        popcount_precalc[1] = 1;
        for (int32 i = 2; i < (1 << 16); i++)
            popcount_precalc[i] = popcount_precalc[i/2] + (i & 1);
    }

    return popcount_precalc[x & 0xffff]
         + popcount_precalc[(x >> 16) & 0xffff]
         + popcount_precalc[(x >> 32) & 0xffff]
         + popcount_precalc[(x >> 48) & 0xffff];
}


inline void read(int32& val)
{
    scan("%" SCNd32, &val);
}

inline void read(int64& val)
{
    scan("%" SCNd64, &val);
}

inline void read(double& val)
{
    scan("%lf", &val);
}

inline void read(string& val, int length = 1e6)
{
    char tmp[length+1];

    scan("%s", tmp);

    val = tmp;
}

template <class S, class T>
inline void read(S& a, T& b)
{
    read(a);
    read(b);
}

template <class S>
inline void read(vector<S> &v, int n)
{
    v.resize(n);
    for (int i = 0; i < n; i++)
        read(v[i]);
}

template <class S, class T, class U>
inline void read(S& a, T& b, U& c)
{
    read(a);
    read(b);
    read(c);
}

template <class S, class T, class U, class V>
inline void read(S& a, T& b, U& c, V& d)
{
    read(a);
    read(b);
    read(c);
    read(d);
}

template <class S, class T, class U, class V, class W>
inline void read(S& a, T& b, U& c, V& d, W& e)
{
    read(a);
    read(b);
    read(c);
    read(d);
    read(e);
}

inline void write(int32 val)
{
    printf("%" PRId32 " ", val);
}

inline void write(int64 val)
{
    printf("%" PRId64 " ", val);
}

inline void write(double val)
{
    printf("%lf ", val);
}

inline void write(const string& val)
{
    printf("%s ", val.c_str());
}

template<class S>
inline void write(const vector<S>& val)
{
    for (S el : val)
        write(el);
}

template<class S>
inline void writeln(const S& a)
{
    write(a);
    printf("\n");
}

template<class S, class T>
inline void writeln(const S& a, const T& b)
{
    write(a);
    write(b);
    printf("\n");
}

template<class S, class T, class U>
inline void writeln(const S& a, const T& b, const U& c)
{
    write(a);
    write(b);
    write(c);
    printf("\n");
}

template<class S, class T, class U, class V>
inline void writeln(const S& a, const T& b, const U& c, const V& d)
{
    write(a);
    write(b);
    write(c);
    write(d);
    printf("\n");
}

template<class S, class T, class U, class V, class W>
inline void writeln(const S& a, const T& b, const U& c, const V& d, const W& e)
{
    write(a);
    write(b);
    write(c);
    write(d);
    write(e);
    printf("\n");
}

#ifdef PCL_DEBUG
    #define DBG_RED "\033[1;31m"
    #define DBG_YELLOW "\033[1;33m"
    #define DBG_BLUE "\033[1;34m"
    #define DBG_NC "\033[0m"

    #define debug(var) { printf("%s%s%s = ", DBG_RED, #var, DBG_NC); writeln(var); }
    #define break_point(str) { printf("%s%s%s\n", DBG_YELLOW, str, DBG_NC); }
#else
    #define debug(...)
    #define break_point(...)
#endif

#include <random>

vector<std::tuple<int32, int32, int64, int32>> v;

struct pair_hash
{
    std::size_t operator()(const std::pair<int32, int32> &pair) const
    {
        return std::hash<int>()(pair.first) ^ std::hash<int>()(pair.second);
    }
};

void dfs(vector<unordered_map<int32, int32>> &graph, vector<int32> &colors, int32 vi, int32 parent, int64 dist, int32 color)
{
    if (dist < 0)
        return;

    colors[vi] = color;

    for (auto [vj, w] : graph[vi])
    {
        if (vj != parent)
            dfs(graph, colors, vj, vi, dist - w, color);
    }
}

void brute_force(int n)
{
    vector<unordered_map<int32, int32>> graph(n);
    vector<int32> colors(n);

    for (auto [op, a, b, w] : v)
    {
        if (op == 1)
        {
            graph[a][b] = w;
            graph[b][a] = w;
        }
        else if (op == 2)
        {
            graph[a].erase(b);
            graph[b].erase(a);
        }
        else if (op == 3)
        {
            dfs(graph, colors, a, -1, b, w);
        }
        else if (op == 4)
        {
            int32 vi = a;

            writeln(colors[vi]);
        }
    }
}

pair<int32, pair<int32, int32>> root(int32 vi, vector<int32> &parent, vector<pair<int32,int32>> &color)
{
    if (parent[vi] == -1)
        return {vi, color[vi]};

    auto [root_vi, color_vi] = root(parent[vi], parent, color);
    if (color_vi.second < color[vi].second)
        color_vi = color[vi];

    return {root_vi, color[vi]};
}

void cale_drzewo(int n)
{
    vector<int32> parent(n, -1);
    vector<pair<int32,int32>> color(n, {0, 0});
    vector<int32> Size(n, 1);
    unordered_map<pair<int32,int32>, int32, pair_hash> edges;

    int32 timer = 1;

    for (auto [op, a, b, w] : v)
    {
        if (op == 1)
        {
            auto [root_a, color_a] = root(a, parent, color);
            auto [root_b, color_b] = root(b, parent, color);

            if (Size[root_a] < Size[root_b])
                swap(root_a, root_b);

            parent[root_b] = root_a;
            Size[root_a] += Size[root_b];
            edges[{a, b}] = root_b;
            edges[{b, a}] = root_b;
        }
        else if (op == 2)
        {
            int32 e = edges[{a, b}];

            auto [root_e, color_e] = root(e, parent, color);

            Size[root_e] -= Size[e];
            parent[root_e] = -1;
            color[root_e] = color_e;

            edges.erase({a, b});
            edges.erase({b, a});
        }
        else if (op == 3)
        {
            auto [root_a, color_a] = root(a, parent, color);

            color[root_a] = {timer, w};
        }
        else if (op == 4)
        {
            int32 vi = a;

            auto [root_vi, color_vi] = root(vi, parent, color);
            writeln(color_vi.second);
        }

        timer++;
    }
}

void distances(int32 vi, int32 parent, int64 d, vector<vector<pair<int32, int32>>> &graph, vector<int64> &dists)
{
    dists[vi] = d;

    for (auto [vj, w] : graph[vi])
    {
        if (vj != parent)
            distances(vj, vi, d + w, graph, dists);
    }
}


void dfs(vector<vector<pair<int32, int32>>> &graph, vector<pair<int32, int32>> &colors, int32 vi, int32 parent, int64 dist, int32 color, int32 timestamp)
{
    if (dist < 0)
        return;

    colors[vi] = { color, timestamp };

    for (auto [vj, w] : graph[vi])
    {
        if (vj != parent)
            dfs(graph, colors, vj, vi, dist - w, color, timestamp);
    }
}

void jedno_drzewo(int n)
{
    vector<vector<pair<int32, int32>>> graph(n);
    vector<pair<int32, int32>> colors(n, {0, 0});

    vector<vector<int32>> binary_leap(n, vector<int32>(log_bit(n) + 1, -1));
    vector<vector<int64>> dists_leap(n, vector<int64>(log_bit(n) + 1, int64(1e15)));

    for (int i = 0; i < n-1; i++)
    {
        int32 z, a, b, w;

        std::tie(z, a, b, w) = v[i];
        graph[a].push_back({b, w});
        graph[b].push_back({a, w});
    }

    // Calculating binary_leap as root = 0
    vector<int32> parent(n, -1);
    vector<int32> depth(n, 0);
    vector<int32> stack = {0};

    while (not stack.empty())
    {
        int32 vi = stack.back();
        stack.pop_back();

        for (auto [vj, w] : graph[vi])
        {
            if (vj != parent[vi])
            {
                parent[vj] = vi;
                depth[vj] = depth[vi] + 1;
                binary_leap[vj][0] = vi;
                dists_leap[vj][0] = w;
                stack.push_back(vj);
            }
        }
    }

    for (int j = 1; j < log_bit(n) + 1; j++)
    {
        for (int i = 0; i < n; i++)
        {
            if (binary_leap[i][j-1] != -1)
            {
                binary_leap[i][j] = binary_leap[binary_leap[i][j-1]][j-1];
                dists_leap[i][j] = dists_leap[i][j-1] + dists_leap[binary_leap[i][j-1]][j-1];
            }
        }
    }

    std::mt19937 rng(std::random_device{}());
    int random_node = std::uniform_int_distribution<int>(0, n-1)(rng);
    vector<int64> dists(n, int64(1e15));

    distances(random_node, -1, 0, graph, dists);

    sort(dists);

    int sqrt_dist = dists[minimum({500, n-1})];
    vector<std::tuple<int32, int64, int32, int32>> last_coloring;

    for (int i = n; i < v.size(); i++)
    {
        auto [op, a, b, w] = v[i];

        if (op == 3)
        {
            int32 color = w;

            if (b <= sqrt_dist)
            {
                dfs(graph, colors, a, -1, b, color, i);
            }
            else
            {
                last_coloring.push_back({a, b, color, i});
            }
        }
        else if (op == 4)
        {
            auto [c, timestamp] = colors[a];
            int j = last_coloring.size() - 1;

            while (j >= 0 and std::get<3>(last_coloring[j]) > timestamp)
            {
                auto [vi, z, color, timestamp] = last_coloring[j];
                
                // Calculating distance beatween a and vi using binary leap

                int32 da = a;
                int32 db = vi;
                int64 dist = 0;

                if (depth[da] < depth[db])
                    swap(da, db);
                
                for (int j = log_bit(n); j >= 0; j--)
                {
                    if (depth[da] - depth[db] >= (1 << j))
                    {
                        dist += dists_leap[da][j];
                        da = binary_leap[da][j];
                    }
                }

                if (da != db)
                {
                    for (int j = log_bit(n); j >= 0; j--)
                    {
                        if (binary_leap[da][j] != -1 and binary_leap[da][j] != binary_leap[db][j])
                        {
                            dist += dists_leap[da][j] + dists_leap[db][j];
                            da = binary_leap[da][j];
                            db = binary_leap[db][j];
                        }
                    }

                    dist += dists_leap[da][0] + dists_leap[db][0];
                }

                if (dist <= z)
                {
                    c = color;
                    break;
                }
            }

            writeln(c);
        }
    }
}

int main()
{
    int n, m, q;

    read(n, m, q);

    v.resize(m + q);
    for (int i = 0; i < m; i++)
    {
        int32 a, b, w;

        read(a, b, w);
        a--;
        b--;
        v[i] = {1, a, b, w};
    }

    for (int i = 0; i < q; i++)
    {
        int32 op;

        read(op);

        if (op == 1)
        {
            int32 a, b, w;

            read(a, b, w);
            a--;
            b--;
            v[m + i] = {1, a, b, w};
        }
        else if (op == 2)
        {
            int32 a, b;

            read(a, b);
            a--;
            b--;
            v[m + i] = {2, a, b, 0};
        }
        else if (op == 3)
        {
            int32 vi, k;
            int64 z;

            read(vi, z, k);
            vi--;
            v[m + i] = {3, vi, z, k};
        }
        else if (op == 4)
        {
            int32 vi;

            read(vi);
            vi--;
            v[m + i] = {4, vi, 0, 0};
        }
    }

    // Rozpoznajemy przypadek
    bool przypadek_1 = (n - 1 == m);
    bool przypadek_2 = true;

    for (int i = 0; i < q; i++)
    {
        if (std::get<0>(v[m + i]) == 1 or std::get<0>(v[m + i]) == 2)
            przypadek_1 = false;
        if (std::get<0>(v[m + i]) == 3 or std::get<2>(v[m + i]) != int64(1e15))
            przypadek_2 = false;
    }

    if (przypadek_1)
        jedno_drzewo(n);
    else if (przypadek_2)
        cale_drzewo(n);
    else
        brute_force(n);

    return 0;
}