#include <bits/stdc++.h>
#define fisiere 1
using namespace std;
/**************************************
 *completeaza numele fisiereleor aici *
 **************************************/
const string NUME_PROGRAM="apm";
#if fisiere==1
ifstream f(NUME_PROGRAM+".in");
ofstream g(NUME_PROGRAM+".out");
#endif // fisiere
const int N = 200010;
int n,m,i,x,y,cst,Cost,rx,ry,t[N],radacina(int);
tuple<int,int,int> M[2*N];
vector<pair<int,int>> e;
int main()
{
    f>>n>>m;
    for(i=1;i<=n;i++)
        t[i]=i;
    for(i=1;i<=m;i++)
    {
        f>>x>>y>>cst;
        M[i]=make_tuple(cst,x,y);
    }
    sort(M+1,M+m+1);
    for(i=1;i<=m;i++)
    {
        tie(cst,x,y)=M[i];
        rx=radacina(x);
        ry=radacina(y);
        if(rx!=ry)
        {
            Cost+=cst;
            t[rx]=rx;
            e.push_back(make_pair(x,y));
        }
    }
    g<<Cost<<'\n';
    g<<e.size()<<'\n';
    for(auto it:e)
        g<<it.first<<' '<<it.second<<'\n';
    return 0;
}
int radacina(int x)
{
    if(t[x]==x)
        return x;
    t[x]=radacina(t[x]);
    return t[x];
}