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//#pragma GCC optimize("Ofast,unroll-loops")
//#pragma GCC target("popcnt,avx,tune=native")
#include <bits/stdc++.h>
using namespace std;
 
#define fwd(i, a, n) for (int i = (a); i < (n); i ++)
#define rep(i, n) fwd(i, 0, n)
#define all(X) begin(X), end(X)
#define sz(X) ((int)X.size())
#define st first
#define nd second
#define pii pair<int, int>
#define vi vector<int>
#define ll long long
 
#ifdef LOC
auto &operator<<(auto &out, pair<auto, auto> a) {
	return out << "(" << a.st << ", " << a.nd << ")";
}
 
auto &operator<<(auto &out, auto a) {
	out << "{";
	for (auto b : a)
		out << b << ", ";
	return out << "}";
}
 
void dump(auto... x) { ((cerr << x << ", "), ...) << '\n'; }
#define debug(x...) cerr << __LINE__ << ": [" #x "]: ", dump(x)
#else
#define debug(...) 0
#endif

const int K = 1500;

vector<set<pair<int, long long>>> g;
vector<set<pair<int, long long>>> compG;

vector<vector<pair<long long, pii>>> events;
vector<int> color;
vector<int> myTime;
vector<bool> vis;
vector<bool> marked;
queue<pair<int, ll>> que;
queue<tuple<int, int, int, ll>> que1;

pair<int, long long> compresss(int v){
    vis[v] = true;
    vector<pair<int, ll>> t;
    for(auto p : g[v]){
        int u = p.st; ll d= p.nd;
        if(!vis[u]){
            pair<int, ll> q = compresss(u);
            if(q.st != -1){
                t.push_back({q.st, q.nd + d});
            }
        }
    }
    if(sz(t) > 1){
        marked[v] = true;
    }
    if(marked[v]){
        for(auto p : t){
            compG[p.st].insert({v, p.nd});
            compG[v].insert({p.st, p.nd});
        }
        return {v, 0};
    }else{
        if(sz(t) == 1){
            return t[0];
        }else{
            return {-1, -1};
        }
    }
}

int32_t main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
    int n, m, q; cin>>n>>m>>q;
    g.resize(n+1);
    compG.resize(n+1);
    events.resize(n+1);
    color.resize(n+1, 0);
    myTime.resize(n+1, -1);
    vis.resize(n+1, false);
    marked.resize(n+1, false);
    rep(i, m){
        int a, b, d;
        cin>>a>>b>>d;
        g[a].insert({b, d});
        g[b].insert({a, d});
    }
    //debug(g);
    vector<array<ll, 4>> query(q);
    rep(i, q){
        cin>>query[i][0];
        if(query[i][0] == 1){
            cin>>query[i][1]>>query[i][2]>>query[i][3];
        }
        if(query[i][0] == 2){
            cin>>query[i][1]>>query[i][2];
        }
        if(query[i][0] == 3){
            cin>>query[i][1]>>query[i][2]>>query[i][3];
        }
        if(query[i][0] == 4){
            cin>>query[i][1];
        }
    }
    for(int t = 0; t < q; t += K){
        for(int i = 1; i <= n; i++)marked[i] = false;
        for(int i = 1; i <= n; i++)vis[i] = false;
        for(int j = t; j < q && j < t + K; j++){
            if(query[j][0] == 1 || query[j][0] == 2){
                marked[query[j][1]] = true;
                marked[query[j][2]] = true;
            }else{
                marked[query[j][1]] = true;
            }   
        }
        for(int i = 1; i <= n; i++){
            if(marked[i] && !vis[i])compresss(i);
        }
        for(int j = t; j < q && j < t + K; j++){
            if(query[j][0] == 1){
                int a = query[j][1]; int b =query[j][2]; long long d = query[j][3];
                g[a].insert({b, d});
                g[b].insert({a, d});
                compG[a].insert({b, d});
                compG[b].insert({a, d});
            }
            if(query[j][0] == 2){
                int  a = query[j][1]; int b = query[j][2];
                g[a].erase(g[a].lower_bound({b, 0}));
                g[b].erase(g[b].lower_bound({a, 0}));
                compG[a].erase(compG[a].lower_bound({b, 0}));
                compG[b].erase(compG[b].lower_bound({a, 0}));
            }
            if(query[j][0] == 3){
                que.push({query[j][1], query[j][2]});
                while(!que.empty()){
                    int v = que.front().st; ll d = que.front().nd; que.pop();
                    color[v] = query[j][3];
                    myTime[v] = j;
                    while(!events[v].empty() && events[v].back().st <= d)events[v].pop_back();
                    events[v].push_back({d, {j, query[j][3]}});
                    for(auto p : compG[v]){
                        if(myTime[p.st] != j && d - p.nd >= 0){
                            que.push({p.st, d - p.nd});
                        }
                    }
                }
                //colorDFS(query[j][1], -1, query[j][2], j, query[j][3]);
            }
            if(query[j][0] == 4){
                int u = query[j][1];
                cout<<color[u]<<"\n";
            }
        }
        for(int v = 1; v <= n; v++){
            if(marked[v] && sz(events[v]) > 0){
                for(auto p : g[v]){
                    if(!marked[p.st]){
                        que1.push({p.st, v, sz(events[v]) - 1, p.nd});
                        while(!que1.empty()){
                            int u = get<0>(que1.front()); 
                            int prev = get<1>(que1.front());
                            int ind = get<2>(que1.front());
                            ll d = get<3>(que1.front());
                            que1.pop();
                            while(ind >= 0 && events[v][ind].st < d)ind--;
                            if(ind < 0)continue;
                            if(events[v][ind].nd.st > myTime[u]){
                                myTime[u] = events[v][ind].nd.st;
                                color[u] = events[v][ind].nd.nd;
                            }
                            for(auto p : g[u]){
                                if(p.st != prev && !marked[p.st]){
                                    que1.push({p.st, u, ind, d + p.nd});
                                }
                            }
                        }
                        //updateColor(p.st, v, p.nd, events[v], sz(events[v]) - 1);
                    }
                }
            }
        }
        for(int v = 1; v <= n; v++){
            compG[v].clear();
            events[v].clear();
        }
    }
	return 0;
}