#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 m,n,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;
																	}