#include <bits/stdc++.h>


using namespace std;
ifstream fin("apm.in");
ofstream fout("apm.out");
int vf, muchii, ct;
long long Suma;
int Tata[200005], Dimensiune[200005];
pair < int, int > Perechi[400005];
struct elemente
{
    int x, y, cost;

} V[400005];
inline bool cmp( elemente a, elemente b )
{
    return a.cost < b.cost;
}
inline int Find( int Nod )
{
    if( Nod != Tata[Nod] )
        Tata[Nod] = Find(Tata[Nod]);
    return Tata[Nod];
}
void Unire( int x, int y )
{
    x = Find(x);
    y = Find(y);

    if( Dimensiune[x] < Dimensiune[y] )
    {
        Dimensiune[y] += Dimensiune[x];
        Tata[x] = y;
    }
    else
    {
        Dimensiune[x] += Dimensiune[y];
        Tata[y] = x;
    }
}
void Kruskal()
{
    for( int i = 1; i <= muchii; ++ i )
    {
        int tata_x = Find(V[i].x);
        int tata_y = Find(V[i].y);

        if( tata_x != tata_y )
        {
            Unire( tata_x, tata_y );

            Suma += V[i].cost;
            Perechi[++ ct].first = V[i].x;
            Perechi[ct].second = V[i].y;
        }
    }
}
int main()
{
    fin >> vf >> muchii;
    for( int i = 1; i <= muchii; ++ i )
        fin >> V[i].x >> V[i].y >> V[i].cost;

    sort( V + 1, V + muchii + 1, cmp );

    for(int i = 1; i <= vf; ++ i)
        Tata[i] = i, Dimensiune[i] = 1;

    Kruskal();

    fout << Suma << "\n" << ct << "\n";
    for(int i = 1; i <= ct; ++ i)
        fout << Perechi[i].second << " " << Perechi[i].first << "\n";
    return 0;
}