import java.util.*;

public class Main {
    private static Scanner sc = new Scanner(System.in);
    public static void main(String[] args) throws Exception {
        String s = sc.next();
        int l = s.length();
        Map<String, Integer> map = new HashMap<>();
 
        for (int i = 0;i < l;i++) {
            String tmp = s.substring(i, i+1);
            if (map.containsKey(tmp)) {
                map.put(tmp, map.get(tmp)+1);
            } else {
                map.put(tmp, 1);
            }
        }
        
        int ret = fact(l);
        
        for (Map.Entry<String, Integer> entry : map.entrySet()) {
            ret /= fact(entry.getValue());
        }
        
        System.out.println(ret-1);
    }

    private static int fact(int n) {
        int ret = 1;
        for (int i = 1;i <= n;i++) {
            ret *= i;
        }
        return ret;
    }
}