#include<iostream>
#include<fstream>
#include<stdlib.h>
using namespace std;
ifstream in("apm.in");
ofstream out("apm.out");
struct muchie{
	int x,y,c;
};
typedef muchie* pm;
muchie vm[400001],h[200000];
int n,m,ct;
int t[200000];
int g[200000];

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


void citire(){
	in>>n>>m;
	int i;
	for(i=1;i<=m;i++)
		in>>vm[i].x>>vm[i].y>>vm[i].c;
}

int Find(int x){
	if(!t[x]) return x;
	return Find(t[x]);
}

void Union(int x, int y){
	int tx=Find(x),ty=Find(y);
	if(g[tx]<g[ty]) t[tx]=ty;
	else{t[ty]=tx;
	if(g[tx]==g[ty])
		g[tx]++;
	}
}

void apm(){
	int i;
		qsort(vm+1,m,sizeof(vm[0]),fcmp);
	int mrel=0;
	i=1;
	while(mrel<n-1){
		int rx=Find(vm[i].x),ry=Find(vm[i].y);
		while(rx==ry){ i++;
			rx=Find(vm[i].x),ry=Find(vm[i].y);
		}
		mrel++;
		h[mrel]=vm[i];
		Union(rx,ry);
		ct+=vm[i].c;
	}
}

int main(){
	citire();
	apm();
	out<<ct<<"\n"<<n-1<<"\n";
	for(int i=1;i<n;i++)
		out<<h[i].y<<" "<<h[i].x<<"\n";
}