#include <fstream>
#include <algorithm>

using namespace std;

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

struct muchie{
        int x, y;
        int c;
} v[400001];

int sef[200001];

int findd(int x){
    int sefmare;
    if(sef[x]!=x){
        sefmare=findd(sef[x]);
        sef[x]=sefmare;
        return sef[x];
    }
    return x;
}

void unire(int x, int y){
    int sefx, sefy;
    sefx=findd(x);
    sefy=findd(y);
    sef[sefy]=sef[sefx];
}

bool comp(muchie x, muchie y){
    return x.c<=y.c;
}
int main()
{
    int n, m, i, s=0, nrm=0;
    fin>>n>>m;
    for(i=1;i<=m;i++)
        fin>>v[i].x>>v[i].y>>v[i].c;
    for(i=1;i<=n;i++)
        sef[i]=i;
    sort(v+1, v+m+1, comp);
    for(i=1;i<=m;i++){
        if(findd(v[i].x)!=findd(v[i].y)){
            s=s+v[i].c;
            nrm++;
            unire(v[i].x, v[i].y);
        }
    }
    fout<<s<<endl<<nrm<<endl;
    for(i=1;i<=m;i++)
        if(sef[v[i].x]!=sef[v[i].y])
            fout<<v[i].x<<" "<<v[i].y<<endl;
    return 0;
}