import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String N = scan.next();
		scan.close();
		int l = N.length();
		int []c = new int[26];
		for(int i = 0; i < l; i++) {
			char t = N.charAt(i);
			c[t - 65]++;
		}
		int num = fact(l);
		int den = 1;

		for(int i = 0; i < 26; i++) {
			if(c[i] != 0) {
				den *= fact(c[i]);
			}
		}
		System.out.println(num / den - 1);
	}
	static int fact(int n) {
		if(n == 1) {
			return 1;
		}else {
			return n * fact(n - 1);
		}
	}
}