#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
#include <algorithm>

using namespace std;

ifstream fin("apm.in");
ofstream fout("apm.out");

void solve(const vector<vector<int>>& graph)
{
    int n = graph.size() - 1;
    vector<int> r(n + 1, 0);
    for(int i = 1; i <= n; i++) {
        r[i] = i;
    }
    int cost_apcm = 0;
    vector<vector<int>> new_edges;
    for(const vector<int>& i: graph) {
        int u = i[0];
        int v = i[1];
        int cost = i[2];
        
        int repU = r[u];
        int repV = r[v];
        
        if(repU != repV) {
            new_edges.push_back({u, v});
            cost_apcm += cost;
            for(int k = 1; k <= n; k++) {
                if(r[k] == repU) {
                    r[k]= repV;
                }
            }
        }
    }
    
    fout << cost_apcm << endl;
    fout << new_edges.size() << endl;
    for(const vector<int>& edge: new_edges)
    {
        fout << edge[0] << ' ' << edge[1] << endl;
    }
}

int main()
{
    int n, m;
    
    fin >> n >> m;
   
    vector<vector<int>> graph;

    for(int i = 0; i < m; i++)
    {
        int a, b, c;
        fin >> a >> b >> c;
        
        graph.push_back({a, b, c});
    }
    
    sort(graph.begin(), graph.end(), [](const vector<int>& a, const vector<int>& b) {
        return a[2] < b[2];
    });
    
    solve(graph);
    
    return 0;
}