import math

S = [x for x in input()]
N = len(S)

l = []
while len(S) > 0:
    c = S[0]
    l.append(S.count(c))
    while c in S:
        S.remove(c)

ans = math.factorial(N)
for x in l:
    ans = ans / math.factorial(x)

print(str(int(ans-1)))