///Complexitat : O(M*log(N))
#include <algorithm>
#include <iostream>
#include <fstream>
using namespace std;
#define Maxim 400001
ifstream f("apm.in");
ofstream g("apm.out");

struct Muchie
{
    int Cost, x, y;
};
Muchie V[Maxim];
pair <int,int> Pr[Maxim];
long long Sum, k;
int Tt[Maxim], Rg[Maxim], N, M;
void Citire()
{
    f >> N >> M;
    for (int i = 1; i <= M; i++ )
        f >> V[i].x >> V[i].y >> V[i].Cost;
}
int Cmp ( Muchie a1, Muchie a2 )
{
    return a1.Cost < a2.Cost;
}
int VerificareTata(int nod)
{
    while ( Tt[nod] != nod)
        nod = Tt[nod];
    return nod;
}
int Unire( int a1, int a2)
{
    if( Rg[a1] > Rg[a2] )
        Tt[a1] = a2;
    if( Rg[a1] < Rg[a2] )
        Tt[a2] = a1;
    if( Rg[a1] == Rg[a2] )
    {
        Tt[a1] = a2;
        Rg[a2] ++;
    }
}
void Afisare()
{
    g << Sum << endl << k << endl;
    for (int i = 1 ; i<=k ; i++ )
        g << Pr[i].first << " " << Pr[i].second << endl;
}
int main()
{
    Citire();
    sort( V+1, V+M+1, Cmp);
    for ( int i = 1; i <= N; i++ )
    {
        Tt[i] = i;
        Rg[i] = 1;
    }
    for ( int i = 1; i <= M ; i++ )
    {
        int tatax = VerificareTata(V[i].x);
        int tatay = VerificareTata(V[i].y);
        if ( tatax != tatay )
        {
            Unire(tatax, tatay);
            Pr[++k].first = V[i].x;
            Pr[k].second = V[i].y;
            Sum = Sum + V[i].Cost;
        }
    }
    Afisare();
    return 0;
}