import math

w = list(input())
n = len(w)

f = math.factorial
def comb(a,b):
    return f(a)//(f(b)*f(a-b))

dct = {}
for i in w:
    dct.setdefault(i,0)
    dct[i] += 1

r = 1
for i,j in dct.items():
    r *= comb(n,j)
    n -= j

print(r-1)