#include <fstream>
#include <algorithm>
using namespace std;
ifstream in("apm.in");
ofstream out("apm.out");
struct ura
{
    int x,y,cost;
};
ura v[400001];
int tata[200001],sefx,sefy;
int sef(int x)
{
        if(x==tata[x])return x;
        else return tata[x]=sef(tata[x]);
}

void unire(int x,int y)
{
    sefx=sef(x);
    sefy=sef(y);
    tata[sefx]=sefy;
}

bool cmp(ura x,ura y) {

	if (x.cost<y.cost)
		return true;

	return false;

}

int main()
{
    int cnt=0,i,j,n,m,suma=0;
    in>>n>>m;
    for(i=1;i<=m;i++)
    {
        in>>v[i].x>>v[i].y>>v[i].cost;
    }
    sort(v+1,v+1+m,cmp);
    for(i=1;i<=n;i++)
        tata[i]=i;
    for(i=1;i<=m&&cnt!=n-1;i++)
    {
        if(tata[v[i].x]!=tata[v[i].y])
        {unire(v[i].x,v[i].y);
        cnt++;
        suma=suma+v[i].cost;
        v[i].cost=1001;}
    }
    out<<suma<<'\n';
    out<<n-1<<'\n';
    for(i=1;i<=m;i++)
    {
        if(v[i].cost==1001)out<<v[i].x<<" "<<v[i].y<<'\n';
    }
    return 0;
}