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

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

struct graf{
    int nod1;
    int nod2;
    int cost;
};

int n, m, nr, father[200002], x;// height[200002];
//vector <graf> graphs;
//vector <graf> solutii;

graf graphs[400002], solutii[400002];


bool compare(graf a, graf b)
{
    return (a.cost < b.cost);
}
void f()
{
    int i;
    for(i = 1; i <= n; i++)
        father[i] = i;
}
int Radacina(int k)
{
    while(father[k] != k)
        k = father[k];
    return k;
}

//void reunite(int a, int b)
//{
    /*if(height[a] > height[b])
        father[b] = a;
    else
    {
        father[a] = b;
        if(height[a] == height[b])
            height[a]++;
    }*/
 //   father[b] = a;
//}

int main()
{
    int a, i = 1, b;
    long long y = 0;
    fin >> n >> m;
    f();
    while(fin >> graphs[i].nod1 >> graphs[i].nod2 >> graphs[i].cost)
        i++;
    sort(graphs + 1, graphs + m + 1, compare);
    i = 1;
    while(i <= m)
    {
        a = Radacina(graphs[i].nod1);
        b = Radacina(graphs[i].nod2);
        if(a != b)
            solutii[x] = graphs[i], father[a] = b, y+=graphs[i].cost, x++;
        i++;
    }
    //a = x;
    //for(i = 0; i < a; i++)
      //  nr+=solutii[i].cost;
    fout << y << '\n';
    fout << x << '\n';
    for(i = 0; i < x; i++)
        fout << solutii[i].nod1 << " " << solutii[i].nod2 << '\n';
    return 0;
}