import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner koko = new Scanner(System.in);
        String s = koko.next();
        int n = s.length();
        char[] ss = s.toCharArray();
        Arrays.sort(ss);
        int count = 1;
        int mo = 1;
        int chi = n;
        int rest = n;
        for(int i=1; i<n; i++){
            if(ss[i]==ss[i-1]){
                count = count + 1;
                rest = rest - 1;
            }else{
                count = 1;
                rest = rest-1;
            }
            mo = count*mo;
            chi = chi*rest;
        }
        int ans = chi/mo;
        System.out.println(ans-1);
    }
}