#include <fstream>
#include <algorithm>
#include <cstring>
#include <vector>
#define nmax 200001
#define mmax 400001
using namespace std;
ifstream cin("apm.in");
ofstream cout("apm.out");

struct muchie
{
    int x,y;
    signed short int cost;
    bool operator < (const muchie &other) const
    {
        return (cost <= other.cost);
    }
};

muchie v[mmax];
vector<muchie> apm;
int tata[nmax], h[mmax], n, m, q, sum;


int rad(int x)
{
    while(tata[x]!=0)
        return rad(tata[x]);
    return x;
}

void unire(muchie crt)
{
    int rx = rad(crt.x);
    int ry = rad(crt.y);
    if(rx!=ry)
    {
        sum+=crt.cost;
        apm.push_back({crt.x,crt.y,crt.cost});
        if(h[rx]==h[ry])
            h[ry]++;
        if(h[rx]>h[ry])
            tata[ry]=rx;
        else
            tata[rx]=ry;
    }
}

int main()
{
    cin>>n>>m;
    for(int i=1; i<=m; i++)
    {
        cin>>v[i].x>>v[i].y>>v[i].cost;
    }
    memset(tata,0,sizeof(tata));
    sort(v+1,v+m+1);

    for(int i=1; i<=m; i++)
    {
        unire(v[i]);
    }
    cout<<sum<<endl<<apm.size()<<endl;
    for(auto mcrt : apm)
        cout<<mcrt.x<<' '<<mcrt.y<<endl;
}