#include<fstream.h>
#include<stdlib.h>
#define NM 200001
#define MM 400001
#define endl "\n"

ifstream fin("apm.in");
ofstream fout("apm.out");
struct muchie{ int x,y,c;
};

int m,n,L[NM];
muchie v[MM],h[NM];
void citire(){
int i;
fin>>n>>m;
for(i=0;i<m;i++)
   fin>>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 min(int x,int y){
if(x<y) return x;
return y;
}
int max(int x,int y){
if(x>y) return x;
return y;
}

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];
     ms++;
     ct=ct+v[i].c;
     int a=min(L[v[i].x],L[v[i].y]);
     int b=max(L[v[i].x],L[v[i].y]);
     for(j=1;j<=n;j++)
       if(L[j]==b) L[j]=a;

	  }
fout<<ct<<endl<<n-1<<endl;
 for(i=0;i<n-1;i++)
 fout<<h[i].x<<" "<<h[i].y<<endl ;

 return 0;
 }