#include <iostream>
#include <fstream>
#include <vector>
using namespace std;

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

vector <pair <int, int>> v[10001];
int c[10001];
bool viz[10001];
int p[10001];

int main()
{
    int n, m, i, j, x, y, z;
    int rasp;

    fin >> n >> m;
    for (i = 1; i<=m; i++)
    {
        fin >> x >> y >> z;
        v[x].push_back ({y, z});
        v[y].push_back ({x, z});
    }

    for (i = 0; i<=n; i++)
        c[i] = 1<<30;
    c[1] = 0;

    rasp = 0;
    for (i = 1; i<=n; i++)
    {
        x = 0;
        for (j = 1; j<=n; j++)
            if (viz[j] == 0 && c[j] < c[x])
                x = j;

        viz[x] = 1;
        rasp = rasp + c[x];

        for (j = 0; j<v[x].size(); j++)
            if (viz[v[x][j].first] == 0 && c[v[x][j].first] > v[x][j].second)
            {
                c[v[x][j].first] = v[x][j].second;
                p[v[x][j].first] = x;
            }
    }

    fout << rasp << '\n';
    fout << n-1 << '\n';
    for (i = 2; i<=n; i++)
        fout << i << ' ' << p[i] << '\n';
    return 0;
}