def solve():
    ns = input()
    trs = str.maketrans("0123456789", "0000455555")
    ns = ns.translate(trs)
    if ns[0] == "0":
        return "5" * (len(ns) - 1)
    if "0" not in ns:
        return ns
    i = ns.index("0")
    s = ns[:i]
    r = "5" * (len(ns) - i)
    if "5" not in s:
        return "4" * (i - 1) + r
    j = s.rindex("5")
    return s[:j] + "4" + "5" * (len(s) - j - 1) + r


case_t = 1
# case_t = int(input())
for _ in [None] * case_t:
    print(solve())