#include <bits/stdc++.h>

using namespace std;
ifstream in("apm.in");
ofstream out("apm.out");
const int MAX=200001;
int n,m,tata[MAX],cnt,cost;
bool sel[MAX];
struct muchie
{
    int x,y,c;
}v[MAX];

bool cmp(muchie a, muchie b)
{
    return a.c<b.c;
}

int radacina(int nod)
{
    if(tata[nod]==nod) return nod;
    int ans;
    ans=radacina(tata[nod]);
    tata[nod]=ans ;//atentie la asta!
    return ans;
}
int main()
{

    in>>n>>m;
    for(int i=1;i<=n;i++) tata[i]=i;
    for(int i=1;i<=m;i++) in>>v[i].x>>v[i].y>>v[i].c;
    sort(v+1,v+m+1,cmp);

    for(int i=1;i<=m;i++)
    {
        if(radacina(v[i].x)!=radacina(v[i].y))
        {
            sel[i]=true;
            cnt++;
            cost+=v[i].c;
            tata[radacina(v[i].x)]=radacina(v[i].y);

        }
    }

    out<<cost<<"\n"<<cnt<<"\n";
    for(int i=1;i<=m;i++)
    {
        if(sel[i]==true) out<<v[i].x<<" "<<v[i].y<<"\n";
    }
    return 0;
}