#include    <fstream>

using namespace std;

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

const int NMax = 400005;

pair <int,int> P[NMax];

int N, M, Total, TT[NMax], k, RG[NMax];

struct Edge
{
    int x,y,c;

}V[NMax];

bool Compare(Edge a, Edge b)
{
    return a.c < b.c;
}

void Read()
{
    fin >> N >> M;

    for(int i = 1; i <= M; i++)
        fin >> V[i].x >> V[i].y >> V[i].c;

    sort(V+1, V+M+1, Compare);
}

int Find(int nod)
{
    while(TT[nod] != nod)
        nod = TT[nod];
    return nod;
}

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

void Solve()
{
    for(int i=1;i<=M;i++)
    {
        if(Find(V[i].x) != Find(V[i].y))
        {
            Unite(Find(V[i].x), Find(V[i].y));
            P[++k].first    =   V[i].x;
            P[k].second     =   V[i].y;
            Total           +=  V[i].c;
        }
    }
}

int main()
{
    Read();

    for(int i = 1; i <= M; i++)
    {   TT[i]=i; RG[i]=1;   }

    Solve();

    fout << Total << "\n";
    fout << N-1 <<"\n";

    for(int i = 1; i <= k; i++)
        fout << P[i].first << " " << P[i].second << "\n";

    return 0;
}