# -*- coding: utf-8 -*-

s, = map(str, raw_input().split())

dic = {}

for t in s:
    if dic.get(t) == None: dic[t] = 0
    dic[t] += 1

def fact(n):
    if n <= 1: return 1
    return n * fact(n - 1)

total = len(s)

res = fact(total)
for key, val in dic.items():
    res /= fact(val)

print res - 1