def comb(n, r):
    res = 1
    for i in range(r):
        res *= n-i
    for i in range(r):
        res /= i+1
    return int(res)

a = [0 for i in range(26)]
s = input()
for i in s:
    a[ord(i)-ord('A')] += 1
n = len(s)
res = 1
for i in a:
    res *= comb(n, i)
    n -= i
print(res-1)