#include <fstream>
#include <algorithm>
using namespace std;
ifstream in("apm.in");
ofstream out("apm.out");
int w[200002];
int n,m,i,ry,rx,l,sol1,x,y,c;
pair < int , pair < int , int > > v[400002];
pair<int,int>sol[200002];
int f(int k)
{
    while(w[k]>0)
        k=w[k];
    return k;
}
int main()
{
    in>>n>>m;
    for(i=1;i<=m;i++)
    {
        in>>x>>y>>c;
        v[i].first=c;
        v[i].second.first=x;
        v[i].second.second=y;
    }
    sort(v+1,v+m+1);
    for(i=1;i<=n;i++)
        w[i]=-1;
    for(i=1;i<=m;i++)
    {
        rx=f(v[i].second.first);
        ry=f(v[i].second.second);
        if(rx!=ry)
        {
            l++;
            sol[l].first=v[i].second.first;
            sol[i].second=v[i].second.second;
            sol1+=v[i].first;
            if(w[rx]<w[ry])
            {
                w[rx]+=w[ry];
                w[ry]=rx;
            }
            else
            {
                w[ry]+=w[rx];
                w[rx]=ry;
            }
        }
    }
    out<<sol1<<endl<<l<<endl;
    for(i=1;i<=l;i++)
    {
        out<<sol[i].first<<" "<<sol[i].second<<endl;
    }
    return 0;
}