import java.util.Scanner;

public class Main {

	public static void main(String[] args) throws Exception {
		Scanner scanner = new Scanner(System.in);
		char[] input = scanner.next().toCharArray();
		scanner.close();

		int[] alphabets = new int[26];
		for (int i = 0; i < input.length; i++) {
			alphabets[(int) input[i] - 'A']++;
		}
		long ans = 1;
		for (int i = 1; i <= input.length; i++) {
			ans *= i;
		}
		for (int i = 0; i < alphabets.length; i++) {
			for (int j = 1; j <= alphabets[i]; j++) {
				ans /= j;
			}
		}
		System.out.println(ans - 1);

	}
}