#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("apm.in");
ofstream fout("apm.out");
const int MMax = 400000;
const int NMax = 200000;
struct Edge
{
    int x,y,cost;
}E[MMax + 5];
int N,M,K,Sol;
int TT[NMax + 5],Idx[NMax + 5],R[NMax + 5];
bool Compare(Edge A, Edge B)
{
    return A.cost <= B.cost;
}

void Read()
{
    fin >> N >> M;
    for(int i = 1; i <= M; ++i)
        fin >> E[i].x>>E[i].y>>E[i].cost;
    sort(E+1,E+M+1,Compare);
}

int Root (int x)
{
    while(x!=TT[x])
    {
        x = TT[x];
    }
    return x;
}

void Unite(int x, int y)
{
    if(R[x] < R[y])
        TT[x] = y;
    if(R[x] > R[y])
        TT[y] = x;
    if(R[x] == R[y])
    {
        TT[x] = y;
        R[y]++;
    }

}

void Solve()
{
    for(int i = 1; i <= N; ++i)
        TT[i] = i;
    for(int i = 1; i <= M; ++i)
    {
        int a =  E[i].x, b = E[i].y, c = E[i].cost;
        if(Root(a) != Root(b))
        {
            Unite(Root(a), Root(b));
            Sol += c;
            Idx[++K] = i;
        }
    }
}

void Print()
{
    fout  << Sol << "\n";
    fout << N-1 << "\n";
    for(int i = 1; i <= K; ++i)
    {
        fout << E[Idx[i]].x << " " << E[Idx[i]].y << "\n";
    }
}

int main()
{
    Read();
    Solve();
    Print();
    return 0;
}