#include <iostream>
#include <fstream>
using namespace std;
ifstream f("atm.in");
ofstream g("apm.out");
struct muchie
{
    int x,y,c;
}v[101],aux;
int n,m,c,nm,i,j,l[101];
void ord(muchie v[101],int n)
{
    for(i=1;i<=n-1;i++)
        for(j=i+1;j<=n;j++)
        if(v[i].c>v[j].c)
    {
        aux=v[i];
        v[i]=v[j];
        v[j]=aux;
    }
}
int main()
{
    f>>n>>m;
    for(i=1;i<=m;i++)
        f>>v[i].x>>v[i].y>>v[i].c;
    ord(v,n);
    for(i=1;i<=n;i++)
    l[i]=i;
    i=1;
    while(nm<n-1)
    {
        if(l[v[i].x]!=l[v[i].y])
        {
            c=c+v[i].c;
            nm++;
            g<<v[i].x<<" "<<v[i].y<<" ";
            g<<endl;
            for(j=1;j<=n;j++)
                if(l[j]==v[i].y)
                l[j]=l[v[i].x];
        }
        i++;
    }
    g<<c;
    return 0;
}