#include <stdio.h>
#include <stdlib.h>

struct entry
{
  struct entry *next;
  int val;
};

int
main (void)
{
  unsigned seqs;
  struct entry *list, **lp;

  scanf ("%u", &seqs);
  lp = &list;
  for (;;) /* Prvni posloupnost nacteme celou */
    {
      int val;
      struct entry *e;
      
      scanf ("%d", &val);
      if (val < 0)
	break;
      e = malloc (sizeof (*e));
      e->val = val;
      *lp = e;
      lp = &e->next;
    }
  *lp = NULL;
  while (--seqs != 0)
    {
      lp = &list;
      for (;;)
	{
	  int val;

	  scanf ("%d", &val);
	  if (val < 0)
	    break;
	  while (*lp != NULL && (*lp)->val < val)
	    *lp = (*lp)->next;
	  if (*lp != NULL && (*lp)->val == val)
	    lp = &(*lp)->next;
	}
      *lp = NULL; /* Zahodime zbyly konec seznamu */
    }
  while (list != NULL)
    {
      printf ("%d%c", list->val, list->next != NULL ? ' ' : '\n');
      list = list->next;
    }
  return EXIT_SUCCESS;
}