#coding: utf-8
##yuki_170
import math
from collections import Counter

s=raw_input()
counter = Counter(s)
dic=dict(counter)

lv=[]
for k,v in dic.items():
 lv.append(v)

fd=1
for i in xrange(len(lv)):
 fd*=math.factorial(lv[i])

res=math.factorial(len(s))/fd
print res-1