Envío 4971

Código

import java.util.Hashtable;
import java.util.Scanner;


public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String palabra = scanner.nextLine();
        String result = "no";
        if(palabra.length() > 26)
        {
            result = "yes";
        }
        else
        {
            Hashtable<Character, Boolean> hash = new Hashtable<>();
            char caracter;
            for(int i = 0; i < palabra.length(); i++)
            {
                caracter = palabra.charAt(i);
                if(hash.containsKey(caracter))
                {
                    result = "yes";
                    break;
                }else
                {
                    hash.put(palabra.charAt(i), false);
                }
            }
        }
        System.out.println(result);
        
    }
}