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

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

const int nmax = 4e5+5;
vector <pair<int,int> > sol;
int dad[nmax], rang[nmax];

struct muchie {
    int x, y, c;
    inline bool operator () (const muchie &a, const muchie &b) {
        return a.c < b.c;
    }
} v[nmax];

int Find(int x) {
    while(dad[x]!=x) x=dad[x];
    return x;
}

void Union(int x, int y) {
    if(rang[x] > rang[y]) dad[y]=x;
    else dad[x]=y;
    if(rang[x]==rang[y]) rang[y]++;
}

int main() {
    ios_base::sync_with_stdio(false);
    int n, m, i, cmin=0, rx, ry;
    fin >> n >> m;
    for(i=1; i<=m; i++)
        fin >> v[i].x >> v[i].y >> v[i].c;
    sort(v+1, v+m+1, muchie());
    for(i=1; i<=n; i++)
        dad[i]=i;
    for(i=1; i<=m; i++) {
        rx=Find(v[i].x);
        ry=Find(v[i].y);
        if(rx!=ry) {
            cmin+=v[i].c;
            Union(rx, ry);
            sol.push_back({v[i].x, v[i].y});
        }
    }
    fout << cmin << "\n" << n-1 << "\n";
    for(auto it : sol)
        fout << it.first << " " << it.second << "\n";
    fin.close();
    fout.close();
    return 0;
}