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

ifstream in("apm.in");
ofstream out("apm.out");

struct muchie{int x,y,c;};
int n,m,L[NM];
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 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+=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;
	   }
out<<ct<<endl<<n-1<<endl;
for(i=0;i<n-1;i++)
 out<<h[i].x<<" "<<h[i].y<<endl;
return 0;
}