#include <fstream>
#include <algorithm>
using namespace std;
pair<int,pair<int,int> > graf[200002];
pair<int,int> sol[400002];
int w[200003];
int rad(int nod)
{
    while(w[nod]>0)
    {
        nod=w[nod];
    }
    return nod;
}
int main()
{
    int n,m,cost,nr,a,b,c,rx,ry;
    ifstream in("apm.in");
    ofstream out("apm.out");
    in>>n>>m;
    for(int i=1;i<=m;i++)
    {
        in>>a>>b>>c;
        graf[i].first=c;
        graf[i].second.first=a;
        graf[i].second.second=b;
    }
    for(int i=1;i<=n;i++)
    {
        w[i]=-1;
    }
    sort(graf+1,graf+m+1);
    cost=0;
    nr=0;
    for(int i=1;i<=m;i++)
    {
        rx=rad(graf[i].second.first);
        ry=rad(graf[i].second.second);
        if(rx!=ry)
        {
            nr++;
            sol[nr].first=graf[i].second.first;
            sol[nr].second=graf[i].second.second;
            cost+=graf[i].first;
            if(w[rx]<w[ry])
            {
                w[rx]+=w[ry];
                w[ry]=rx;
            }
            else
            {
                w[ry]+=w[rx];
                w[rx]=ry;
            }
        }
    }
    out<<cost<<"\n"<<nr<<"\n";
    for(int i=1;i<=nr;i++)
    {
        out<<sol[i].first<<" "<<sol[i].second<<"\n";
    }
    return 0;
}