#include<fstream.h>
#include<stdlib.h>

ifstream in("apm.in");
ofstream out("apm.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];
	   }
for(i=0;i<n-1;i++)
 out<<h[i].x<<" "<<h[i].y<<" "<<h[i].c<<endl;
}