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

struct Edge {int v; int w;};

int main () {
    int n, m;
    cin >> n >> m;
    vector <vector <Edge> > adj (n);

    for (int j = 0; j < m; j++) {
        int u, v, w;
        cin >> u >> v >> w;
        u -= 1;
        v -= 1;
        adj[u].push_back ({v, w});
        adj[v].push_back ({u, w});
    }
    return 0;
}