#!/usr/bin/python

def toggle(n):
	if n == "0":
		return "1"
	else:
		return "0"

s = raw_input()
inverting = "0"
o = ""

for a in range(len(s)):
	if inverting == "1":
		v = toggle(s[a])
	else:
		v = s[a]

	o = o + v

	inverting = v

print o