def fact(n):
	if n == 0: return 1
	vl = 1
	for i in range(0, n):
		vl *= i+1
	return vl

S = raw_input()
counter = []
for i in range(0, 26):
	counter.append(0)
for i in range(0, len(S)):
	counter[ord(S[i])-65] += 1
tmp = fact(len(S))
for i in range(0, 26):
	tmp /= fact(counter[i])
print tmp-1