import java.util.*;
public class Main{
	public static void main(String... args){
		Scanner scan = new Scanner(System.in);
		String s = scan.next();
		System.out.println(calc(s));
	}

	public static int calc(String str){
		
		LinkedList<Integer> overlap = new LinkedList<Integer>();
		String[] sp = str.split("");
		Arrays.sort(sp,new Comparator<String>(){
			@Override
			public int compare(String obj0,String obj1){
				return obj0.compareTo(obj1);
			}
		});

		int count = 1;
		String now = "";
		for(int i = 0; i < str.length(); i++){
			now = sp[i];
			if(now.equals("n"))continue;
			sp[i] = "n";
			for(int j = i; j < str.length(); j++){
				if(sp[j].equals("n"))continue;
				if(now.equals(sp[j])){
					count++;
					sp[j] = "n";
				}
			}
			overlap.add(count);
			count = 1;
		}

		int result = 1;
		for(int i = str.length(); 1 <= i; i--){
			result *= i;
		}

		int subresult = 1;
		int r = 1;
		int next = 0;
		for(Iterator<Integer> it = overlap.iterator(); it.hasNext();){
			next = it.next();
			if(next == 1)continue;
			for(int i = next; 1 <= i; i--){
				r*=i;
			}
			subresult*=r;
			r = 1;
		}
		return (result/subresult)-1;

	}
}