#!/usr/bin/env python

import sys

import empty
import dbg

def run():
	av = sys.argv[ 1 : ]
	if len( av ) < 2:
		dbg.help_exit( 'from_word to_word' )

	(from_word, to_word) = av[ : 2 ]
		
	e = empty.new()
	e.show = False

	def cnv(s):
		if e.show:
			if to_word in s:
				i = s.index( to_word ) + len( to_word )
				e.show = False
				return s[ : i ] + cnv( s[ i : ] )
			return s
		else:
			if from_word in s:
				i = s.index( from_word )
				e.show = True
				return cnv( s[ i : ] )
			return ''

	while True:
		s = sys.stdin.readline()
		if not s:
			break
		s = cnv( s )
		sys.stdout.write( s )

if __name__ == "__main__":
	run()
# EOF