import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class Main {

	@SuppressWarnings("resource")
	public static void main(String args[]) {
		Scanner scanner = new Scanner(System.in);
		String s=scanner.next();
		Map<String ,Integer>map=new HashMap<>();
		for(int i=0;i<s.length();i++){
			String key=s.substring(i, i+1);
			if (map.containsKey(key)) {
				map.put(key, map.get(key) + 1);
			} else {
				map.put(key, 1);
			}
		}
		long ans=kaijo(s.length());
		for(int val:map.values()){
			ans/=kaijo(val);
		}
		System.out.println(ans-1);
	
	}
	
	static long kaijo(int n){
		long s = 1;
		for (int i = 1; i <= n; i++)
			s *= i;
			return s;
	}
}