fun readStr () =
    let
        fun scan reader stream = SOME (StringCvt.splitl (not o Char.isSpace) reader (StringCvt.skipWS reader stream))
    in
        valOf (TextIO.scanStream scan TextIO.stdIn)
    end

fun fact 0 = 1
  | fact 1 = 1
  | fact n = 
    n * fact (n - 1)


val () =
    let
        val s = readStr ()

        val table = List.foldl (fn (ch, array) =>
                                   let
                                       val index = Char.ord ch - Char.ord #"A"
                                       val oldValue = Array.sub (array, index)
                                       val newValue = oldValue + 1
                                   in
                                       (
                                         Array.update (array, index, newValue);
                                         array
                                       )
                                   end)
                               (Array.array (26, 0))
                               (String.explode s)

        val ans = (Array.foldl (fn (n, acc) =>
                                   acc div (fact n))
                               (fact (String.size s))
                               table) - 1
                             
    in
        print (Int.toString ans ^ "\n")
    end