#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#define N 200000
#define M 400000

typedef struct
{
    int x, y, c;
} muchie;

muchie e[M];
int t[N+1], nr[N+1];
bool in_apm[M];

int radacina(int x)
{
    if (t[x] == 0)
    {
        return x;
    }
    t[x] = radacina(t[x]);
    return t[x];
}

void reuniune(int x, int y)
{
    int rx = radacina(x);
    int ry = radacina(y);
    if (rx == ry)
    {
        return;
    }
    if (nr[rx] < nr[ry])
    {
        t[rx] = ry;
        nr[ry] += nr[rx];
    }
    else
    {
        t[ry] = rx;
        nr[rx] += nr[ry];
    }
}

bool verif(int x, int y)
{
    return (radacina(x) == radacina(y));
}

int cmp(const void* p1, const void* p2)
{
    muchie e1 = *(muchie*)p1;
    muchie e2 = *(muchie*)p2;
    return (e1.c - e2.c);
}

int main()
{
    FILE *in, *out;
    in = fopen("apm.in", "r");
    out = fopen("apm.out", "w");
    int n, m;
    fscanf(in, "%d%d", &n, &m);
    for (int i = 0; i < m; i++)
    {
        fscanf(in, "%d%d%d", &e[i].x, &e[i].y, &e[i].c);
    }
    qsort(e, m, sizeof(e[0]), cmp);
    for (int i = 1; i <= n; i++)
    {
        nr[i] = 1;
    }
    int nrc = n, cost = 0, i = 0;
    while (nrc > 1)
    {
        if (!verif(e[i].x, e[i].y))
        {
            nrc--;
            reuniune(e[i].x, e[i].y);
            cost += e[i].c;
            in_apm[i] = true;
        }
        i++;
    }
    fprintf(out, "%d\n%d\n", cost, n - 1);
    for (int i = 0; i < m; i++)
    {
        if (in_apm[i])
        {
            fprintf(out, "%d %d\n", e[i].x, e[i].y);
        }
    }
    fclose(in);
    fclose(out);
    return 0;
}