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#include <iostream>
#include <vector>
#include <utility>
#include <limits>
using namespace std;

const int MXV = 200007; 

vector<bool> vis(MXV);
vector<int> colored(MXV);

void dfs(vector<vector<pair<int, int>>> &v, int idx, int z, int k)
{
    vis[idx] = true;
    colored[idx] = k;

    for (auto i : v[idx])
    {
        if (i.second <= z && !vis[i.first])
        {
            dfs(v, i.first, z - i.second, k);
        }
    }
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int n, m, q, a, b, d, k, lb, del = 0;
    cin >> n >> m >> q;
    vector<vector<pair<int, int>>> v(MXV);

    for (int i = 0; i < m; i++)
    {
        cin >> a >> b >> d;
        v[a].push_back({b, d});
        v[b].push_back({a, d});
    }

    for (int i = 0; i < q; i++)
    {
        cin >> lb;

        if (lb == 1)
        {
            cin >> a >> b >> d;
            v[a].push_back({b, d});
            v[b].push_back({a, d});
        }

        if (lb == 2)
        {
            cin >> a >> b;

            for (auto it = v[a].begin(); it != v[a].end(); ++it)
            {
                if (it->first == b)
                {
                    v[a].erase(it);
                    break;
                }
            }

            for (auto it = v[b].begin(); it != v[b].end(); ++it)
            {
                if (it->first == a)
                {
                    v[b].erase(it);
                    break;
                }
            }
        }

        if (lb == 3)
        {
            cin >> a >> b >> k;
            if (a < MXV && b <= numeric_limits<int>::max() && k <= numeric_limits<int>::max())
            {
                dfs(v, a, b, k);
                vis.assign(MXV, false);
            }
        }

        if (lb == 4)
        {
            cin >> a;
            if (a < MXV)
            {
                cout << colored[a] << endl;
            }
        }
    }


return 0;
}