package main

import . "fmt"
import . "math/big"

func main() {
	var s string
	Scan(&s)
	m := map[rune]int{}
	for _, ch := range s {
		m[ch]++
	}
	n := int64(len(s))
	ans := NewInt(1)
	for _, cnt := range m {
		k := int64(cnt)
		ans.Mul(ans, new(Int).Binomial(n, k))
		n -= k
	}
	ans.Sub(ans, NewInt(1))
	Println(ans)
}