S = input()
N = len(S)
ans = []
def dfs(n,s):
	if n == (1 << N) - 1:
		ans.append(s)
		return
	for i in range(N):
		if (n >> i) & 1 == 0:
			dfs(n | (1<<i),s + S[i])
dfs(0,"")
s = set(ans)
s.remove(S)
print(len(s))