from collections import Counter
from math import factorial


def calc_combination(all_: int, partial_: int) -> int:
    return factorial(all_) // (factorial(partial_) * factorial(all_ - partial_))


def main():
    S = input()
    s_counter = Counter(S)
    rest = s_counter.total()
    patterns = 1
    for _, count_ in s_counter.most_common():
        patterns *= calc_combination(rest, count_)
        rest -= count_

    print(patterns - 1)


if __name__ == "__main__":
    main()