import java.util.*;

public class Main {
	public static void main (String[] args) {
    	Scanner sc = new Scanner(System.in);
    	char[] arr = sc.next().toCharArray();
    	int[] counts = new int[26];
    	for (char c : arr) {
    	    counts[c - 'A']++;
    	}
    	long ans = kaijo(arr.length);
    	for (int x : counts) {
    	    ans /= kaijo(x);
    	}
    	System.out.println(ans - 1);
	}
	
	static long kaijo(int x) {
	    if (x == 0) {
	        return 1;
	    } else {
	        return x * kaijo(x - 1);
	    }
	}
}