def fact(x);(1..x).inject(:*);end
s=gets.chars.to_a.sort!
a=[1]
s.inject(){|m,e|
    if m==e
        a[-1]+=1
    else
        a+=[1]
    end
    e
}
n=fact(s.size)
a.each{|e|n/=fact(e)}
p n-1