#include <cstdio>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("apm.in");
ofstream fout("apm.out");
struct muchie
{
    int x,y,c;
};
int  n,m,i,t[200001],h[200001],k,cost,sol[200001];
muchie a[400001];

int compare(muchie x,muchie y)
{
    return x.c<y.c;
}

int muchie(int x,int y)
{
    int r1,r2,x1,y1,c;
    r1=x;
    r2=y;
    while (r1!=t[r1]) r1=t[r1];
    while (r2!=t[r2]) r2=t[r2];
    while (t[x]!=r1)
    {
        x1=t[x];
        t[x]=r1;
        x=x1;
    }
    while (t[y]!=r2)
    {
        y1  =r2;
        t[y]=t[y1];
        y=y1;
    }
    if (r1==r2) return 0;
    if (h[r1]>h[r2])
    {
        t[r2]=r1;
        c=r1;
    }
    else
    {
        t[r1]=r2;
        c=r2;
    }
    if (h[r1]==h[r2]) h[c]++;

    return 1;
}
int main()
{
    fin>>n>>m;
    for (i=1; i<=m; i++)
        fin>>a[i].x>>a[i].y>>a[i].c;
    sort(a+1,a+m+1,compare);
    for (i=1; i<=n; i++)
    {
        t[i]=i;
        h[i]=1;
    }
    k=0;
    i=1;
    while (k<n-1)
    {
        if (muchie(a[i].x,a[i].y))
        {
            cost+=a[i].c;
            sol[++k]=i;
        }
        i++;
    }
    fout<<cost<<'\n'<<n-1<<'\n';
    for(i=1;i<=n-1;i++)
        fout<<a[sol[i]].y<<" "<<a[sol[i]].x<<'\n';
    return 0;
}