import java.util.*;

public class Exercise93{
  public static void main (String[] args){

    Scanner sc = new Scanner(System.in);

    String str = sc.next();

    int baseR = getRoutes(str.length());

    ArrayList<Integer> s = new ArrayList<Integer>();

    for(int i = 0; i < str.length(); i++){
      int count = 1;
      for (int j = i + 1; j < str.length(); j++){
        if(str.charAt(i) == str.charAt(j)){
          count++;
        }
      }
      if(count > 0){
        s.add(count);
      }
    }
    int sameR = 1;
    for(int i = 0; i < s.size(); i++){
      sameR *= getRoutes(s.get(i));
    }
    System.out.println(baseR / sameR - 1);
  }
  private static int getRoutes(int num){
    int r = 1;
    for (int i = 0; i < num; i++){
      r *= num - i;
    }
    return r;
  }
}