import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        int L = S.length();
        int [] al = new int [26];
        for(int i=0; i<L; i++){
            int t = S.charAt(i)-65;
            al[t]++;
        }
        int r=fac(L);
        for(int i=0; i<26; i++){
            int t= fac(al[i]);
            r/=t;
        }
        System.out.println(r-1);
    }
    static int fac(int x){
        if(x<=1){
            return 1;
        }else{
            int t = x*fac(x-1);
            return t;
        }
    }
}