#include <iostream>
#include <vector>
#include <fstream>
#include <algorithm>

using namespace std;

ifstream f("apm.in");
ofstream g("apm.out");

int *t;

struct triplu
{
    int a,b,cost;
};

bool comp (triplu i,triplu j) { return (i.cost<j.cost); }

int find_set(int &x)
{
    return t[x] ? t[x]=find_set(t[x]) : x;
}

bool gasire(int &x,int &y)
{
    return find_set(x)==find_set(y);
}

void uniune(int &x,int &y)
{
    t[x]=y;
}

int main()
{
    int n,m,cost=0,*c,j=0;
    vector <triplu> v;
    f>>n>>m;
    triplu x;
    for (int i=0;i<m;i++)
    {
        f>>x.a>>x.b>>x.cost;
        v.push_back(x);
    }
    sort(v.begin(),v.end(),comp);
    t=new int[n+1];
    c=new int[n-1];
    for (register int i=1;i<=n;i++) t[i]=0;
    for (register int i=0;i<m && j<n-1;i++)
        if (!gasire(v[i].a,v[i].b))
        {
        uniune(v[i].a,v[i].b);
        c[j++]=i;
        cost+=v[i].cost;
        }
    g<<cost<<endl<<n-1<<endl;
    for (register unsigned int i=0;i<n-1;i++) g<<v[c[i]].a<<" "<<v[c[i]].b<<endl;
    return 0;
}