#! /usr/bin/env python
import fileinput
import sys

try:
   lines1 = fileinput.input(sys.argv[1])
   lines2 = fileinput.input(sys.argv[2])
   out = []
   list_lines1 = []
   list_lines2 = []
   for line1 in lines1:
   	list_lines1.append(str(line1).replace("\n", ""))
   for line2 in lines2:
   	list_lines2.append(str(line2).replace("\n", ""))

   for line1 in list_lines1:
	if line1  in list_lines2:
		if line1 not in out:
			out.append(line1)
			print line1



except IOError:
   print "I/O error"