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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("kruskal.in");
ofstream g("kruskal.out");

int n,m,M[100],p,cost=0;
struct muchie
{
	int x,y,c;
}v[100],aux;
void citire()
{
	int i;
	f>>n>>m;
	for(i=1;i<=m;i++)
	{
		f>>v[i].x;
		f>>v[i].y;
		f>>v[i].c;
	}
}
void quicksort(int s,int d)
{
    int i,j,pivot;
    if(s<d)
    {
        i=s;
        j=d;
        pivot=v[s].c;
        while(i<j)
        {
            while(pivot>=v[i].c) i++;
            while(pivot<v[j].c) j--;
            if(i<j)
            {
                aux=v[i];v[i]=v[j];v[j]=aux;
            }
        }
        aux=v[s];
        v[s]=v[j];
        v[j]=aux;
        quicksort(s,j-1);
        quicksort(j+1,d);
    }
}
int main()
{
	int i,j;
    citire();
    quicksort(1,m);
    for(i=1;i<=n;i++)
    {
        M[i]=i;
    }
	i=1;
    p=0;
	while(p<n-1)
    {
        if(M[v[i].x]!=M[v[i].y])
        {
            p++;
            g<<v[i].x<<" "<<v[i].y<<"\n";
			cost=cost+v[i].c;
            int a=M[v[i].x];
            int b=M[v[i].y];
            for(j=1;j<=n;j++)
            {
                if(M[j]==b) M[j]=a;
            }
        }
        i++;
    }
	g<<"Costul total: "<<cost;
}