#include <bits/stdc++.h>
using namespace std;

ifstream fin("apm.in");
ofstream fout("apm.out");
///platou2

struct Patru
{
    int x, y, c, v;
    bool operator<(const Patru e) const
    {
        return c < e.c;
    }
} a[400005];

int t[200005], n, m;

int Find(int x)
{
    int rad, y;
    rad = x;
    while(t[rad] != 0)
        rad = t[rad];
    while(x != rad)
    {
        y = t[x];
        t[x] = rad;
        x = y;
    }
    return rad;
}

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


int main()
{
    ios_base::sync_with_stdio(0);
    fin.tie(0);
    fout.tie(0);
    int i, x, y;
    fin >> n >> m;
    for(i=1; i<=m; i++)
    {
        fin >> a[i].x >> a[i].y >> a[i].c;
        a[i].v = 0;
    }
    sort(a + 1, a + m + 1);
    int nrc = n;
    int sum = 0;
    for(i=1;i<=m && nrc > 1;i++)
    {
        x = Find(a[i].x);
        y = Find(a[i].y);
        if(x != y)
        {
            Union(x, y);
            sum += a[i].c;
            a[i].v = 1;
            nrc--;
        }
    }
    fout << sum << "\n" << n - 1 << "\n";
    for(i=1;i<=m;i++)
        if(a[i].v == 1) fout << a[i].x << " " << a[i].y << "\n";
    fin.close();
    fout.close();
    return 0;
}