#!/usr/bin/python
# Global search and replace from standard input to standard output
# Usage: gsr pattern replacement <infile >outfile

import re, string, sys

pattern= sys.argv[1]
replacement= sys.argv[2]

rexp= re.compile(pattern)

while 1:
    line= sys.stdin.readline()
    if not line:
	break
    outline= rexp.sub(replacement, line)
    sys.stdout.write(outline)