s = input()

s1 = list(s)
s2 = list(set(s1))
s3 = [ s1.count(s2[i]) for i in range(len(s2)) ]

prod_list = [1]

for i in range(sum(s3)):
    prod_list.append(prod_list[-1]*(i+1))

d = 1
for i in range(len(s3)):
     d *= prod_list[s3[i]]
ans = (prod_list[sum(s3)])//d-1
print(ans)