from collections import defaultdict
import math


def main():
    s = input()
    d = defaultdict(int)
    for c in s:
        d[c] += 1

    ans = math.factorial(len(s))
    for v in d.values():
        ans /= math.factorial(v)
    print(int(ans) - 1)
    
if __name__ == '__main__':
    main()