#include <cstdio>
#include <algorithm>
using namespace std;

struct muchie
{
    int i, j, cost;
    friend bool operator < (const muchie &a, const muchie &b)
    {
        return a.cost < b.cost;
    }
};

muchie v[400005];
int n, m, t[200005], a[200005];

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

    return x;
}

int main()
{
    FILE *f = fopen("apm.in", "r");
    fscanf(f, "%d%d", &n, &m);
    for (int i = 1; i <= m; ++i)
        fscanf(f, "%d%d%d", &v[i].i, &v[i].j, &v[i].cost);
    fclose(f);

    sort(v+1, v+m+1);

    int na = 0, cost = 0;
    for (int i = 1; i <= m; ++i)
    {
        int ri = radacina(v[i].i), rj = radacina(v[i].j);
        if (ri != rj)
            t[ri] = rj, a[++na] = i, cost += v[i].cost;
    }

    f = fopen("apm.out", "w");
    fprintf (f, "%d\n%d\n", cost, n-1);
    for (int i = 1; i <= n - 1; ++i)
        fprintf(f, "%d %d\n", v[ a[i] ].i, v[ a[i] ].j);

    fclose(f);

    return 0;
}