from fractions import gcd
from heapq import*
import math
from collections import defaultdict, Counter
import sys
sys.setrecursionlimit(10 ** 7)
MOD = 10 ** 9 + 7


def main():
    s = list(input())
    l = set(s)
    d = Counter(s)

    ans = 1
    for i in range(1, len(s) + 1):
        ans *= i
    for k in d.keys():
        v = 1
        if d[k] > 1:
            for i in range(1, d[k] + 1):
                v *= i
            ans //= v
    print(ans - 1)


if __name__ == '__main__':
    main()