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

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

struct muchie{int x,y,c;};

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