#include<iostream>
#include<fstream>
#include<vector>
#include<limits.h>
#include<algorithm>
#include<queue>

using namespace std;

ifstream f("apm.in");
ofstream o("apm.out");

int n,m,cost=0,t[200010],r[200010]; bool viz[200010];
struct muchie{int x,y,c;};
vector <muchie> v;
vector <pair<int,int> > p;

bool conditie(muchie a,muchie b){
    return a.c<b.c;
}
void citire(){
    f>>n>>m; int i,x,y,c;
    for(i=1;i<=m;i++){
        f>>x>>y>>c;
        v.push_back({x,y,c});
    }
    sort(v.begin(),v.end(),conditie);
    for(i=1;i<=n;i++)
        t[i]=i,r[i]=1;
}
int tata(int nod){
    while(t[nod]!=nod)
        nod=t[nod];
    return nod;
}
void unire(int t1,int t2){
    if(r[t1]<r[t2]) t[t1]=t2;
    else if(r[t2]<r[t1]) t[t2]=t1;
    else{
        t[t1]=t2; r[t2]++;
    }
}
void apm(){
    int i,t1,t2;
    for(i=0;i<m;i++){
        t1=tata(v[i].x);
        t2=tata(v[i].y);
        if(t1!=t2){
            unire(t1,t2);
            cost+=v[i].c;
            p.push_back(make_pair(v[i].x,v[i].y));
        }
    }
}
int main(){
    citire();
    apm();
    o<<cost<<'\n'<<p.size()<<'\n';
    int i;
    for(i=0;i<p.size();i++)
        o<<p[i].first<<" "<<p[i].second<<'\n';
    o.close();
    f.close();
}