Envío 2524

Código

import java.util.Scanner;
class Main {
  public static void main(String[] args) {
   Scanner scan = new Scanner(System.in);
  
   String l = scan.nextLine();
   int[] letras = new int[26];
   boolean r = false;
   for(int i=0; i<l.length(); i++){
    letras[l.charAt(i)-'a']++;
    if(letras[l.charAt(i)-'a']>1) r = true;System.out.println("yes");
break;
  }
 if(!r) System.out.println("no");
 else System.out.println("yes");
 }
}