#include <bits/stdc++.h>

using namespace std;

struct el
{
    int x,y,c;
};
el v[400055];

bool ord(const el & a,const el & b)
{
    if(a.c<b.c)
    {
        return true;
    }
    else
    {
        return false;
    }
}

int pr[200055];

int p(int k)
{
    if(pr[k]!=k)
    {
        pr[k]=p(pr[k]);
    }
    return pr[k];
}

int f[400055];

int main()
{
    ifstream cin("apm.in");
    ofstream cout("apm.out");
    int n,m;
    cin>>n>>m;
    for(int i=1;i<=m;++i)
    {
        cin>>v[i].x>>v[i].y>>v[i].c;
    }
    sort(v+1,v+m+1,ord);
    for(int i=1;i<=n;++i)
    {
        pr[i]=i;
    }
    int sum=0,cnt=0;
    for(int i=1;i<=m;++i)
    {
        int rx = p(v[i].x);
        int ry = p(v[i].y);
        if (rx != ry)
        {
                        f[i]=1;
            sum+=v[i].c;
            cnt++;
           pr[ry] = rx; // sau invers
        }


    }
    cout<<sum<<"\n"<<cnt<<"\n";
    for(int i=1;i<=m;++i)
    {
        if(f[i]==1)
        {
            cout<<v[i].x<<" "<<v[i].y<<"\n";
        }
    }
    return 0;
}