#include <fstream>
#include <vector>
#include <algorithm>

#define NMAX 200003
using namespace std;

int tati[NMAX+3],n,m;
int cost=0;
bool viz[400003];

struct val{
   int x,y,cost;
}muchii[400003];
//vector<val> muchii;

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

int cmp(val a,val b)
{
    return a.cost<b.cost;
}

int cRad(int nr)
{
    int k=nr;
    while(tati[k]>0)
    {
        k=tati[k];
    }
    return k;
}

int main()
{
    fin>>n>>m;
    for(int i=1; i<=m; i++)
    {
        int x,y,cost;
        fin>>muchii[i].x>>muchii[i].y>>muchii[i].cost;
    }
    sort(muchii+1,muchii+m+1,cmp);
    int nrm=0;

    for(int i=1; nrm<n-1; i++)
    {
        int rad1=cRad(muchii[i].x);
        int rad2=cRad(muchii[i].y);
        if(rad1!=rad2)
        {
            cost+=muchii[i].cost;
            viz[i]=1;
            nrm++;
            if(tati[rad1]<=tati[rad2])
            {
                tati[rad1]+=tati[rad2];
                tati[rad2]=rad1;
            }
            else{
                tati[rad2]+=tati[rad1];
                tati[rad1]=rad2;
            }
        }

    }
    fout<<cost<<"\n"<<n-1<<"\n";
    for(int i=1; i<=m; i++)
    {
        if(viz[i])
        {
            fout<<muchii[i].x<<" "<<muchii[i].y<<"\n";
        }
    }
    return 0;
}