import java.util.Arrays;
import java.util.LinkedList;
import java.util.Scanner;

public class Main {
	
	public static final int SIZE = 26;
	
	public static long fact(long n){
		long ret = 1;
		for(long i = 1; i <= n; i++){
			ret *= i;
		}
		return ret;
	}
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		final char[] inputs = sc.next().toCharArray();
		
		char[] counter = new char[SIZE];
		for(final char c : inputs){
			counter[c - 'A']++;
		}
		
		long answer = fact(inputs.length);
		for(int i = 0; i < SIZE; i++){
			answer /= fact(counter[i]);
		}
		
		System.out.println(answer - 1);
	}
	
}