///kruskal
#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;

ifstream fin("apm.in");
ofstream fout("apm.out");

struct muchie{
    int x, y;
    int cost;
    int viz = 0;
}muc[200001];

int n, m;
int t[200001];
int h[200001];

void initializare()
{
    for(int i = 1; i <= n; ++i)
    {
        t[i] = i;
        h[i] = 1;
    }

}

int gasim_tata(int x)
{
    int aux = x;
    while(t[x] != x)
        x = t[x];
    while(aux != x)
    {
        int next = t[aux];
        t[aux] = x;
        aux = next;
    }
    return x;
}

void unire(int x, int y)
{
    int tata_y = gasim_tata(y);
    int tata_x = gasim_tata(x);
    if(h[tata_y] < h[tata_x])
    {
        t[tata_y] = tata_x;
        h[tata_y] = h[tata_x];
    }
    else if(h[tata_x] < h[tata_y])
    {
        t[tata_x] = tata_y;
        h[tata_x] = h[tata_y];
    }
    else
    {
        t[tata_x] = tata_y;
        h[tata_y]++;
        h[tata_x] = h[tata_y];
    }
}

bool comp(muchie a, muchie b)
{
    return a.cost < b.cost;
}

void citire()
{
    fin >> n >> m;
    for(int i = 0; i < m; ++i)
        fin >> muc[i].x >> muc[i].y >> muc[i].cost;
}

int kruskal()
{
    int c = 0;
    for(int i = 0; i < m; ++i)
        {
            if(gasim_tata(muc[i].x) != gasim_tata(muc[i].y))
            {
                muc[i].viz = 1;
                c += muc[i].cost;
                unire(muc[i].x, muc[i].y);
            }
        }
    return c;
}

int main()
{
    citire();
    initializare();
    sort(muc, muc + m, comp);
    fout << kruskal() << '\n' << n - 1 << '\n';
    for(int i = 0; i < m; ++i)
        if(muc[i].viz)
            fout << muc[i].x << ' ' << muc[i].y << '\n';
    return 0;
}