import java.util.*;
public class Main {
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		String a = sc.next();
		HashMap<Character, Integer> set = new HashMap<>();
		int waa=1;
		for(int i=1;i<=a.length();i++){
			waa*=i;
		}
		for(int i=0;i<a.length();i++){
			if(set.get(a.charAt(i))==null) {
				set.put(a.charAt(i),0);
				}
			set.put(a.charAt(i),set.get(a.charAt(i))+1);
		}
		for (Character string : set.keySet()) {
			for(int i=1;i<=set.get(string);i++){
				waa/=i;
			}
		}
		System.out.println(waa-1);
	}
}