#include <bits/stdc++.h>

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

int n, m;
int c, x, y;
int ctot;
int t[100005], inalt[100005];
vector<pair<int, pair<int, int>>> v;
vector<pair<int, int>> res;
int rad(int nod){
    if(nod == t[nod]) return nod;
    int rnod = rad(t[nod]);
    t[nod] = rnod;
    return rnod;
}
void reuniune(){
    int rx = rad(x);
    int ry = rad(y);
    if(inalt[rx] > inalt[ry]){
        t[ry]=rx;
    }
    else if(inalt[rx] < inalt[ry]){
        t[rx]=ry;
    }
    else{
        t[ry]=rx;
        inalt[rx]++;
    }
}
bool interogare(){
    return (rad(x)==rad(y));
}
int main()
{
    fin>>n>>m;
    for(int i=1; i<=n; i++) t[i]=i;
    for(int i=1; i<=m; i++){
        fin>>x>>y>>c;
        v.push_back({c, {x, y}});
    }
    sort(v.begin(), v.end());
    for(auto k:v){
        x=k.second.first;
        y=k.second.second;
        if(!interogare()){
            reuniune();
            ctot+=k.first;
            res.push_back({x, y});
        }
    }
    fout<<ctot<<'\n';
    fout<<res.size()<<'\n';
    for(auto k : res){
        fout<<k.first<<' '<<k.second<<'\n';
    }

    return 0;
}