import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.HashMap;

public class Main {

	public static void main(String[] args) {
	      BufferedReader stdReader =new BufferedReader(new InputStreamReader(System.in));
	      try {
	    	  String line = stdReader.readLine();
	    	  HashMap<Character, Integer> hashMap = new HashMap<>();
	    	  ArrayList<Character> charList = new ArrayList<>();
	    	  for(int i=0;i<line.length();i++){
	    		  if(!hashMap.containsKey(line.charAt(i))){
	    			  hashMap.put(line.charAt(i), 1);
	    			  charList.add(line.charAt(i));
	    		  }else{
	    			  int num = hashMap.get(line.charAt(i));
	    			  hashMap.remove(line.charAt(i));
	    			  hashMap.put(line.charAt(i), num+1);
	    		  }
	    	  }
	    	  
	    	  int ans = 1;
	    	  int n = line.length();
	    	  for(int i=0;i<charList.size();i++){
	    		  ans *= comb(n, hashMap.get(charList.get(i)));
	    		  n -= hashMap.get(charList.get(i));
	    	  }
	    	  
	    	  System.out.println(ans-1);
	      } catch (IOException e) {
			e.printStackTrace();
	      }
	}

	
	public static int comb(int n,int r){
		int temp1 = 1;
		int temp2 = 1;
		int loop = r;
		for(int i=0;i<loop;i++){
			temp1 *= n--;
			temp2 *= r--;
		}
		return temp1/temp2;
		
	}
}