package main

import (
	"fmt"
)

func fact(x int) int {
	if x == 0 {
		return 1
	}
	return x * fact(x-1)
}

func main() {
	var S string
	fmt.Scan(&S)
	cs := make([]int, 26)
	for _, r := range S {
		cs[r-'A']++
	}
	res := fact(len(S))
	for _, x := range cs {
		res /= fact(x)
	}
	fmt.Println(res - 1)
}