#include <fstream>
#include <algorithm>

using namespace std;

ifstream f("apm.in");
ofstream g("apm.out");


int tata[200005], c, ct, n, m;

struct nod
{
    int x, y, cost;
} v[400005], w[400005];

bool cmp(nod a, nod b)
{
    return a.cost < b.cost;
}

int rad(int x)
{
    if(tata[x] != x)
        tata[x] = rad(tata[x]);
    return tata[x];
}

void unire(int x, int y)
{
    x = rad(x);
    y = rad(y);
    if(x != y)
        if(x < y)
            tata[y] = x;
        else
            tata[x] = y;
}

int main()
{
    f >> n >> m;

    for(int i = 1; i <= n; i++)
        tata[i] = i;

    for(int i = 1; i <= m; i++)
        f >> v[i].x >> v[i].y >> v[i].cost;

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

    for(int i = 1; i <= m; i++)
        if(rad(v[i].x) != rad(v[i].y))
        {
            unire(v[i].x, v[i].y);
            c += v[i].cost;
            w[++ct].x = v[i].x, w[ct].y = v[i].y;
        }

    g << c << '\n' << ct << '\n';

    for(int i = 1; i <= ct; i++)
        g << w[i].x << ' ' << w[i].y << '\n';

    return 0;
}