#include<fstream>
#include<stdlib>
#define NM 200001
#define MM 400001

using namespace std;

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){
return (x<=y?x:y);
}
int max(int x,int y){
return (x>=y?x:y);
}

int Find(int x){
if(x==L[x]) return x;
return L[x]=Find(L[x]);
}

void Union(int x,int y){

int px=Find(x);
int py=Find(y);

if(px<py) {L[py]=px;}
else {L[px]=py;}
}

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

int main(){
int i,ms=0,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){
 int px,py;
 do{
 px=Find(v[i].x);
 py=Find(v[i].y);
	if(px==py) i++;

	} while(px==py) ;
	  h[ms]=v[i];
	  ms++;
	  ct=ct+v[i].c;
 Union(v[i].x,v[i].y);
	}

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