package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	S := next()

	m := make(map[rune]int, 26)
	for _, c := range S {
		m[c]++
	}
	ans := fact(len(S))
	for _, v := range m {
		ans /= fact(v)
	}
	ans--
	fmt.Println(ans)
}

func fact(n int) int {
	result := 1
	for n > 0 {
		result *= n
		n--
	}
	return result
}

var sc = bufio.NewScanner(os.Stdin)

func next() string {
	sc.Split(bufio.ScanWords)
	sc.Scan()
	return sc.Text()
}