#include<fstream.h>
#include<stdlib.h>
#define NM 200//01
#define MM 400//001
#define endl "\n"

ifstream in("apm.in");
ofstream out("apm.out");
struct muchie{int x,y,c;};
int L[NM],n,m;
muchie v[MM],h[NM];

void citire(){
int i;
in>>n>>m;
for(i=0;i<m;i++)
in>>v[i].x>>v[i].y>>v[i].c;
}

int fcmp(void const *a,void const *b){
return ((muchie*)a)->c-((muchie*)b)->c;
}

int main(){
int i,ms=0,j,ct=0;
citire();
qsort(v,m,sizeof(v[0]),fcmp);
for(i=1;i<=n;i++) L[i]=i;
i=0;
while(ms<n-1){
  while(L[v[i].x]==L[v[i].y]) i++;
  h[ms]=v[i];
  ct+=v[i].c;
  for(j=1;j<=n;j++)
  if(L[j]==v[i].y)
  L[j]=v[i].x;
  }
out<<ct<<endl<<n-1<<endl;
for(i=0;i<n-1;i++)
  out<<h[i].x<<" "<<h[i].y<<endl;
  return 0;
  }