#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#define MAX 400005

using namespace std;

int n, m, t[MAX], suma;
vector <pair<int,pair<int, int> > > g;
vector <pair<int, int> >rasp;
vector <pair<int,pair<int, int> > >::iterator it;
vector <pair<int, int> >::iterator it1;

void citire()
{
    scanf("%d %d", &n, &m);
    int x, y, c;
    for(int i=1; i<=m; ++i)
    {
        scanf("%d %d %d", &x, &y, &c);
        g.push_back(make_pair(c, make_pair(x, y)));
    }
    sort(g.begin(), g.end());
    for(int i=1; i<=n; ++i)
        t[i]=i;
}

int radacina(int x)
{
    while(x!=t[x])
    {
        x=t[x];
    }
    return x;
}

int verificareMultime(int x, int y)
{
    if(radacina(x)==radacina(y))
        return 0;
    return 1;
}

void inserare(int x, int y)
{
    t[radacina(x)]=radacina(y);
    rasp.push_back(make_pair(x, y));
}

void rezolvare()
{
    int nr=1;
    for(it=g.begin(); it!=g.end() && nr<=n-1; ++it)
    {
        if(verificareMultime(it->second.first, it->second.second))
        {
            inserare(it->second.first, it->second.second);
            suma+=it->first;
            nr++;
        }
    }
}

void afisare()
{
    printf("%d\n%d\n", suma, n-1);
    for(it1=rasp.begin(); it1!=rasp.end(); ++it1)
        printf("%d %d\n", it1->first, it1->second);
}

int main()
{
    freopen("apm.in", "r", stdin);
    freopen("apm.out", "w", stdout);
    citire();
    rezolvare();
    afisare();
    return 0;
}