#!/usr/bin/python

​

import sys

​

f1 = sys.argv[1]

f2 = sys.argv[2]

​

fp1 = open(f1, 'r')

fl1 = fp1.readlines()

fp1.close()

​

fp2 = open(f2, 'r')

fl2 = fp2.readlines()

fp2.close()

​

print "".join([x for x in fl2 if not x in fl1])

​