// Online C++ compiler to run C++ program online
#include <bits/stdc++.h>

using namespace std;

int main(){
    
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    
    int n, m;cin >> n >> m;
    
    vector<vector<long>> cityMap (n + 1, vector<long> (m + 1, 0));
    
    for(int i = 0; i < m; i++){
        
        int a, b;
        long r; cin >> a >> b >> r;
        
        cityMap[a][b] = max(cityMap[a][b],r);
    }
    
    int q; cin >> q;
    
    while(q--){
        
        int f, t;
        long r; cin >> f >> t >> r;
        
        if(r == 1)cout << "-1\n";
        else cout << r - 1 << '\n';
        
    }
    
    
    
    
    
    
    
    
    
    
    
    return 0;
}