S = input()
L = len(S)

def nCr(n,r):    
    r = min(r, n-r)
    npr=1
    for i in range(n,n-r,-1):
        npr*=i    
    factr =1
    for i in range(r,1,-1):
        factr*=i
    return npr//factr

a = [0] * 26
for s in S:
    i = ord(s) - ord('A')
    a[i] += 1

ans = 1
n = L
for r in a:
    if n == 0:
        break
    ans *= nCr(n, r)
    n -= r

ans -= 1
print(ans)