Envío 6395

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();   
       System.out.println(isRepeated(word));
}

public static String isRepeated(String word){
    int [] letters = new int[26];

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