import java.util.Scanner;
public class Yuki170{
	public static void main(String[] arg){
		Scanner sc = new Scanner(System.in);
		int[] al = new int[26];
		int b=1,res;
		String s = sc.next();
		for(int i = 0;i<s.length();i++){
			al[s.charAt(i) - 'A']++;
		}
		for(int i = 0;i<26;i++){
			if(al[i] != 0){
				b *= Ban(al[i]);
			}
		}
		res = Ban(s.length())/b - 1;
		System.out.println(res);
	}
	public static int Ban(int n){
		if(n == 1)return 1;
		return n * Ban(n-1);
	}
}