import java.util.*;

public class Main {
	public static void main (String[] args)  {
		Scanner sc = new Scanner(System.in);
		char[] arr = sc.next().toCharArray();
		HashMap<Character, Integer> map = new HashMap<>();
		for (char c : arr) {
		    if (map.containsKey(c)) {
		        map.put(c, map.get(c) + 1);
		    } else {
		        map.put(c, 1);
		    }
		}
		long base = kaijo(arr.length);
		for (int x : map.values()) {
		    base /= kaijo(x);
		}
		System.out.println(base - 1);
	}
	
	static long kaijo(long x) {
	    if (x <= 1) {
	        return 1;
	    } else {
	        return x * kaijo(x - 1);
	    }
	}
}