# include <fstream>
# include <vector>
# include <set>
# define DIM 200010
# define INF 1000000000
# define f first
# define s second
using namespace std;
ifstream fin("apm.in");
ofstream fout("apm.out");
vector<pair<int,int> > Lista[DIM];
set<pair<int,int> > myset;
set<pair<int,int> >::iterator it;
int Marcat[DIM],t[DIM],d[DIM],sol,n,m,i,x,y,cost,nc,nv;
int main () {
    fin>>n>>m;
    for(i=1;i<=m;i++){
        fin>>x>>y>>cost;
        Lista[x].push_back(make_pair(y,cost));
        Lista[y].push_back(make_pair(x,cost));
    }
    myset.insert(make_pair(-INF,1));
    d[1]=-INF;
    for(i=2;i<=n;i++)
        d[i]=INF;
    while(!myset.empty()){
        it=myset.begin();
        nc=it->s;
        if(Marcat[nc]==0){
            Marcat[nc]=1;
            if(nc!=1)
                sol+=it->f;
            myset.erase(it);
        }
        else{
            myset.erase(it);
            continue;
        }
        for(i=0;i<Lista[nc].size();i++){
            nv=Lista[nc][i].f;
            cost=Lista[nc][i].s;
            if(d[nv]>=cost&&Marcat[nv]==0){
                d[nv]=cost;
                t[nv]=nc;
                myset.insert(make_pair(d[nv],nv));
            }
        }
    }
    fout<<sol<<"\n"<<n-1<<"\n";
    for(i=2;i<=n;i++)
        fout<<i<<" "<<t[i]<<"\n";
    return 0;
}