#include<fstream.h>
#include<stdlib.h>
ifstream in("kruskal.in");
ofstream out("kruskal.out");

struct muchie{ int x,y,c;
						 };
int n,m,L[1000];
muchie v[1000],h[1000];
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;
	}

void 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;
			for(j=1;j<=n;j++)
			 if(L[j]==L[v[i].y])
			 L[j]=L[v[i].x];
			 }
 out<<ct<<endl;
 for(i=0;i<n-1;i++)
		out<<h[i].x<<" "<<h[i].y<<" "<<h[i].c<<endl;
		}
																																																																																																																																																								#include<string.h>