using System;

public class Program

{

    public static void Main()

{

          int num;

          num=int.Parse(Console.ReadLine());

        while (num != 0) {

        if (num % 10 % 2 == 0) {

       Console.WriteLine(num%10);

       }

       num /= 10;

      }

​

       }

       static void CountEven (int num)

    {

   }

   }

​