#include<stdlib.h>
#include<fstream.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 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 fcmp(void const *a,void const *b){
return ((muchie*)a)->c-((muchie*)b)->c;
}
int main(){
int i,ms=0,ct=0,j;
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;
	}
 out<<ct<<endl<<n-1<<endl;
 for(i=0;i<n-1;i++) out<<h[i].x<<" "<<h[i].y<<endl;
 return 0;
 }