from math import factorial
S = input()
n = len(S)
dict = {}
for x in S:
    if x in dict:
        dict[x] +=1
    else:
        dict[x] = 1
list1 = dict.values()
list1 = list(filter(lambda x : x!=1, list1))
ans = factorial(n)
for x in list1:
    ans //= factorial(x)
ans-=1
print(ans)