#include <bits/stdc++.h>

using namespace std;

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

struct muchie{
    int x, y, c;
    bool operator < (const muchie A) const
    {
        return A.c > c;
    }
}M[400002];

int n, m, T[200002], sum, ans[400002], len;

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

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

void Afisare()
{
    fout << sum << "\n" << len << "\n";
    for(int i = 1; i <= len; i++)
        fout << M[ans[i]].x << " " << M[ans[i]].y << "\n";
}

int main()
{
    int i;
    fin >> n >> m;
    for(i = 1; i <= m; i++)
        fin >> M[i].x >> M[i].y >> M[i].c;
    sort(M + 1, M + m + 1);
    for(i = 1; i <= n; i++)
        T[i] = i;
    for(i = 1; i <= m; i++)
    {
        int t1 = Find(M[i].x);
        int t2 = Find(M[i].y);
        if(t1 != t2)
        {
            Union(t1, t2);
            sum += M[i].c;
            ans[++len] = i;
        }
    }
    Afisare();
    return 0;
}