import math
S = input()
N = len(S)

s = []
count = []
for i in range(N):
    if S[i] in s:
        continue
    else:
        x = S.count(S[i])
        s.append(S[i])
        count.append(S.count(S[i]))

n = math.factorial(N)
for j in count:
    n /= math.factorial(j)
print(int(n-1))