#include <bits/stdc++.h>
using namespace std;
struct muchie
{
    int i, j, cost;
};
int n, m;
vector<muchie>drum;
vector<int>parent;
vector<int>rnk;
int find_set(int a)
{
    if(parent[a] != a)
        parent[a] = find_set(parent[a]);
    return parent[a];
}
void union_set(int a, int b)
{
    a = find_set(a);
    b = find_set(b);
    if(a != b)
    {
        if(rnk[a] < rnk[b])
            swap(a,b);
        parent[b] = a;
        if(rnk[a] == rnk[b])
            rnk[a]++;
    }
}
int main()
{
    ifstream fin("apm.in");
    ofstream fout("apm.out");
    int x, i, j, c;
    fin >>n>>m;
    parent.resize(n+1);
    rnk.resize(n+1);
    for(x = 0; x < m; x++)
    {
        fin >>i>>j>>c;
        drum.push_back({i,j,c});
    }
    sort(drum.begin(),drum.end(),[](const muchie &a, const muchie &b)
         {
             return a.cost < b.cost;
         });
    for(i = 1; i <= n; i++)
    {
        parent[i] = i;
        rnk[i] = 0;
    }
    int S = 0;
    vector<pair<int,int>>muchii_alese;
    for(x = 0; x < m; x++)
    {
        if(find_set(drum[x].i) != find_set(drum[x].j))
        {
            S += drum[x].cost;
            muchii_alese.push_back({drum[x].j,drum[x].i});
            union_set(drum[x].i,drum[x].j);
        }
    }
    fout <<S<<"\n"<<muchii_alese.size()<<"\n";
    for(auto &edge:muchii_alese)
    {
        fout <<edge.first<<" "<<edge.second<<"\n";
    }
    return 0;
}