#include<fstream.h>
#include<stdlib.h>
#include<conio.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;
}