import math
import sys
def S(): return sys.stdin.readline().rstrip()
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int, sys.stdin.readline().rstrip().split())
def LI(): return list(map(int, sys.stdin.readline().rstrip().split()))
def LS(): return list(sys.stdin.readline().rstrip().split())

s = S()
ss = set(s)
ans = math.factorial(len(s))

for i in ss:
    cnt = s.count(i)
    ans //= math.factorial(cnt)

print(ans-1)