import sys


def main():
    sys.setrecursionlimit(1000000)
    input = lambda: sys.stdin.readline()[:-1]
    S = list(map(int, input()))

    S[-1] ^= 1
    print("".join(map(str, S)))


if not __debug__:
    f = open(sys.argv[1], "r")
    sys.stdin = f

main()