#include <bits/stdc++.h>

using namespace std;
ifstream fin("apm.in");
ofstream fout("apm.out");
int n, m, ct, sel, parent[200001], h[200001];

struct Edge {
    int x, y, c;
} e[400001];

vector<Edge> v;

bool comp(Edge e1, Edge e2){
    return (e1.c < e2.c);
}

int root(int x){
    if(parent[x] == 0) return x;
    return root(parent[x]);
}

int main() {
    fin >> n >> m;
    for (int i=1; i<=m; i++) {
        fin >> e[i].x >> e[i].y >> e[i].c;
        h[e[i].x] = max(h[e[i].x], h[e[i].y] + 1);
    }

    for(int i=11; i<=n; i++) parent[i] = i;

    sort(e+1, e+m+1, comp);

    for(int i=1; i<=m and sel<n-1; i++){
        int r1 = root(e[i].x);
        int r2 = root(e[i].y);
        if(r1 != r2){
            sel++;

            if(h[r1] < h[r2]) parent[r1] = r2;
            else parent[r2] = r1;

            ct += e[i].c;
            v.push_back(e[i]);
        }
    }

    fout<<ct<<'\n'<<v.size()<<'\n';
    for(auto e: v) fout<<e.x<<" "<<e.y<<'\n';
    return 0;
}