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  1. import java.util.Scanner;
  2.  
  3. public class EvenNumbers {
  4.     public static void main(String[] args){
  5.         Scanner scanner = new Scanner(System.in);
  6.  
  7.         String input = scanner.nextLine();
  8.  
  9.         input = input.replaceAll("[^-?0-9]+", " ").trim();
  10.         String[] words = input.split(" ");
  11.  
  12.         if(input.equals("")){
  13.             System.out.print(-1);
  14.             return;
  15.         }
  16.  
  17.         Long maxEvenNumber = Long.MIN_VALUE;
  18.  
  19.         long[] numbers = new long[words.length];
  20.         for(int i = 0; i < words.length; i ++){
  21.             numbers[i] = Integer.parseInt(words[i]);
  22.             if(numbers[i] % 2 == 0){
  23.                 long evenNumber = numbers[i];
  24.                 if(evenNumber > maxEvenNumber){
  25.                     maxEvenNumber = evenNumber;
  26.                 }
  27.             }
  28.         }
  29.         System.out.println(maxEvenNumber);
  30.     }
  31. }
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