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

using namespace std;

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

const int nMax = 200005;
const int mMax = 400005;
int n, m;
int t[nMax];

struct triplet
{
    int x, y, cost, viz;
};
triplet a[mMax];

bool cmp(const triplet A, const triplet B)
{
    return A.cost < B.cost;
}


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

int Find(int x)
{
    int aux, rad;
    rad = x;
    while (t[rad])
    {
        rad = t[rad];
    }
    while (t[x])
    {
        aux = t[x];
        t[x] = rad;
        x = aux;
    }
    return rad;
}


int main()
{
    fin >> n >> m;
    for (int i = 1; i <= m; i++)
        fin >> a[i].x >> a[i].y >> a[i].cost;
    sort(a + 1, a + m + 1, cmp);

    int cost, v, w, nrc = n,costt = 0;
    for (int i = 1; i <= m and nrc > 1; i++)
    {
        v = a[i].x;
        w = a[i].y;
        v = Find(v);
        w = Find(w);
        if (v != w)
        {
            Union(v, w);
            a[i].viz = 1;
            costt += a[i].cost;
            nrc--;
        }
    }
    fout << costt << "\n";
    fout << n - 1 << "\n";
    for (int i = 1; i <= m; i++)
        if (a[i].viz == 1)
            fout << a[i].x << " " << a[i].y << "\n";


    return 0;
}