import math
S = list(input())
bunnsi = math.factorial(len(S))
bunnbo = 1
S.sort()
count = 1
for i in range(len(S)-1):
    if S[i] != S[i+1]:
        bunnbo *= math.factorial(count)
        count = 1
    else:
        count += 1
bunnbo *= math.factorial(count)
print(bunnsi // bunnbo - 1)