#include<fstream>
#include<algorithm>
using namespace std;
#define MMAX 400005
#define NMAX 200005

ifstream f("apm.in");
ofstream g("apm.out");
struct muchie
{
    int x,y,c;
} a[MMAX];
int n,m,tata[NMAX],ind[NMAX];

void citire()
{
    f>>n>>m;
    for(int i=1; i<=m; i++)
        f>>a[i].x>>a[i].y>>a[i].c;
}

bool cmp(muchie x,muchie y)
{
    return (x.c<y.c);
}

int rad(int x)
{
    while(tata[x]!=x)
        x=tata[x];
    return x;
}
int main()
{
    citire();
    sort(a+1,a+m+1,cmp);
    for(int i=1; i<=n; i++)
        tata[i]=i;
    int k=0,i=1,ct=0;
    while(k<n-1)
    {
        int r1=rad(a[i].x),r2=rad(a[i].y);
        if(r1!=r2)
        {
            k++,ct+=a[i].c,ind[k]=i;
            if(r1<r2)tata[r2]=r1;
            else tata[r1]=r2;
        }
        i++;
    }
    g<<ct<<"\n"<<k<<"\n";
    for(i=1; i<=k; ++i)
        g<<a[ind[i]].x<<" "<<a[ind[i]].y<<"\n";
    return 0;
}