#!/usr/bin/python

import sys
from difflib import unified_diff

if len(sys.argv) < 3:
	sys.exit(1)

from_file = sys.argv[1]
to_file = sys.argv[2]

f1 = open(from_file, 'U').readlines()
f2 = open(to_file, 'U').readlines()

diff = unified_diff(f1, f2, from_file, to_file)

for line in diff:
	sys.stdout.write(line)