#include<fstream.h>
void main()
{ ifstream f("nr1.txt"), g("nr2.txt");
  int x,y,n,m,i,j;
  f>>n; g>>m;
  i=j=1;
  f>>x; g>>y;
  while(i<=n && j<=m)
	if(x<y) { f>>x; i++;}
	else if(y<x) { g>>y; j++; }
		 else { cout<<x<<" "; f>>x; g>>y; i++; j++; }
}