from collections import Counter
import sys


def input(): return sys.stdin.readline().rstrip('\n')


def f(x):
    a = 1
    for i in range(1, x+1):
        a *= i
    return a


def main():
    s = input()
    ans = f(len(s))
    for k, v in Counter(s).items():
        ans //= f(v)
    print(ans-1)


if __name__ == '__main__':
    main()