# -*- coding:utf-8 -*-
import collections
import math
if __name__ == "__main__":
	s = raw_input()
	l = len(s)
	s_set = set(s)
	n = len(s_set)
	count = collections.Counter(s)
	ans = math.factorial(l)
	for i in count.values():
		ans /= math.factorial(i)
	print ans -1