#include <bits/stdc++.h>
using namespace std;
vector<int> tati;
vector<int> heig;
vector<set<int>> q;
vector<int> ras;
void init(int n)
{
    tati.push_back(0);
    heig.push_back(0);
    for(int i = 1; i <= n; i++)
    {
        tati.push_back(i);
        heig.push_back(1);
    }
}
int query(int node)
{
    int tn = node;
    while(tn != tati[tn])
        tn = tati[tn];
    int tnn = node;
    while(tnn != tati[tnn])
    {
        int ax = tnn;
        tnn = tati[tnn];
        tati[ax] = tn;
    }
    return tn;
}
void join(int node1, int node2, int cost)
{
    node1 = query(node1);
    node2 = query(node2);
    if(q[node1].size() > q[node2].size())
    {
        swap(node1, node2);
    }
    for(auto it = q[node1].begin(); it != q[node1].end(); it++)
    {
        if(q[node2].find((*it)) != q[node2].end())
        {
            ras[(*it)] = cost;
            q[node2].erase((*it));
        }
        else
        {
            q[node2].emplace((*it));
        }
    }
    q[node1].clear();
    if(heig[node1] < heig[node2])
    {
        tati[node1] = node2;
    }
    else if(heig[node1] == heig[node2])
    {
        tati[node2] = node1;
        heig[node1]++;
        swap(q[node1], q[node2]);
    }
    else
    {
        tati[node2] = node1;
        swap(q[node1], q[node2]);
    }
}
int main()
{
    freopen("radiatie.in", "r", stdin);
    freopen("radiatie.out", "w", stdout);
    int n, m, k;
    cin >> n >> m >> k;
    vector<pair<int, pair<int, int>>> v;
    for(int i = 0; i < m; i++)
    {
        int x, y, c;
        cin >> x >> y >> c;
        v.push_back({c, {x, y}});
    }
    sort(v.begin(), v.end());
    init(n);
    q.resize(n+1);
    ras.resize(k);
    for(int i = 0; i < k; i++)
    {
        int x, y;
        cin >> x >> y;
        q[x].emplace(i);
        q[y].emplace(i);
    }
    for(auto it = v.begin(); it != v.end(); it++)
    {
        if(query((*it).second.first) != query((*it).second.second))
        {
            join((*it).second.first, (*it).second.second, (*it).first);
        }
    }
    for(auto it = ras.begin(); it != ras.end(); it++)
    {
        cout << (*it) << "\n";
    }
}