Envío 6392

Código

import java.util.*;
public class Main {

    public static void main(String[] args) throws java.lang.Exception {
        Scanner sc = new Scanner(System.in);
        String word = sc.nextLine();   
       
    int [] letters = new int[26];

    for(Character c: word.toCharArray()){
    if(letters[c-'a']>0){
   System.out.println("yes");
   break;
       }
   letters[c-'a']++;
    }
System.out.println("no");

  }
}