#include<fstream.h>
#include<stdlib.h>
#define NM 200//001
#define MM 400//001
#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 Find(int x){
if(x==L[x]) return x;
return 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 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){
	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+=v[i].c;
	 int a=max(px,py);
	 int b=min(px,py);
Union(b,a);
}

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