#include <iostream>
#include <fstream>
#include <algorithm>

using namespace std;

int n, m, tata[400005];

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

struct Muchii{
    int x, y, cost, p;
};
Muchii a[400005];

inline bool Compar (const Muchii A, const Muchii B){
    return A.cost < B.cost;
}

void Read(){
    fin >> n >> m;

    for (int i = 1; i <= m; i++){
        fin >> a[i].x >> a[i].y >> a[i].cost;
        a[i].p = 0;
    }

    sort (a + 1, a + m + 1, Compar);
}

int Find(int x)
{
    int rad, y;
    rad = x;

    while(tata[rad] != 0)
    {
        rad = tata[rad];
    }

    while (x != rad){
        y = tata[x];
        tata[x] = rad;
        x = y;
    }
    return rad;
}

void Union (int x, int y){
    tata[x] = y;
}

void APM (){
    int x, y, sumacosturi = 0, numardemuchii;
    for (int i = 1; i <= m; i++){
        x = Find (a[i].x);
        y = Find (a[i].y);

        if (x != y){
            sumacosturi += a[i].cost;
            Union(x, y);
            a[i].p = 1;
            numardemuchii++;
        }
    }

    fout << sumacosturi << "\n" << numardemuchii << "\n";

    for (int i = 1; i <= m; i++){
        if (a[i].p == 1){
            fout << a[i].y << " " << a[i].x << "\n";
        }
    }
}
int main()
{
    Read ();
    APM ();
    return 0;
}