#include <iostream>
#include <fstream>

using namespace std;

ifstream f("date.in");
ofstream g("date.out");

int n,m,viz[100]={0},ct=0;;

struct grafm {
    int x,y,cost;
};
grafm v[100],aux;

void citire()
{
    int i;
    f>>n>>m;
    for(i=1;i<=m;i++)
        f>>v[i].x>>v[i].y>>v[i].cost;
}

void sortv()
{
    int i,j;
    for(i=1;i<=m;i++)
        for(j=1;j<=m;j++)
            if(v[i].cost<v[j].cost)
            {
                aux=v[i];
                v[i]=v[j];
                v[j]=aux;
            }
}

void prim()
{
    int i,k;
    sortv();
    viz[v[1].x]=1; viz[v[1].y]=1;
    g<<"("<<v[1].x<<" "<<v[1].y<<")"<<'\n';
    ct=v[1].cost;
    for(k=1;k<=n-2;k++)
    {
        i=1;
        while(viz[v[i].x]==viz[v[i].y]) i++;
        g<<"("<<v[i].x<<" "<<v[i].y<<")"<<'\n';
        if(viz[v[i].x]!=0) viz[v[i].y]=1;
        else viz[v[i].x]=1;
        ct=ct+v[i].cost;
    }
    g<<'\n'<<ct;
}

int main()
{
    citire();
    prim();
    return 0;
}