S=input()

def fct(i):
    if(i==0):
        return 1
    else:
        return i*fct(i-1)
    
d={}
for i in range(65,65+26):
    d[chr(i)]=0
for s in S:
    d[s]+=1
    
cal=1
for i in d.values():
    if(i!=0):
        cal*=fct(i)

print(int((fct(len(S))/cal)-1))