#include <bits/stdc++.h>
using namespace std;
int nodes, edges, res = 0 , rang[200005], t[200005];
vector < pair <int ,int> > sol;
pair <int , pair <int , int> > edge[400005];
inline int get_tata(int nod)
{
    while (t[nod] != nod)
        nod = t[nod];
    return nod;
}
inline void unite(pair <int , pair <int , int> > muchie)
{
    int t1 = get_tata(muchie.second.first);
    int t2 = get_tata(muchie.second.second);
    if (t1 != t2)
    {
        if (rang[t1] >= rang[t2])
            rang[t1] += (rang[t1] == rang[t2]) , t[t2] = t1;
        else t[t1] = t2;
        
        res += muchie.first;
        sol.push_back(make_pair(muchie.second.first , muchie.second.second));
    }
    
    return ;
}
int main()
{
    freopen("input", "r", stdin);
    freopen("output", "w", stdout);
    scanf("%d %d", &nodes, &edges);
    
    for (int i = 1; i<=edges; ++i)
        scanf("%d %d %d", &edge[i].second.first, &edge[i].second.second, &edge[i].first);
    
    sort(edge + 1, edge + edges + 1);
    
    for (int i = 1; i<=nodes; ++i)
        t[i] = i , rang[i] = 1;
    for (int i = 1; i<=edges; ++i)
        unite(edge[i]);
    printf("%d\n%d\n", res, (int)sol.size());
    for (auto &it : sol)
        printf("%d %d\n", it.first, it.second);
    
    
    return 0;
}