using System;
using System.Linq;
using System.Collections.Generic;

namespace Print_Even_Numbers
{
    class Program
    {
        static void Main(string[] args)
        {
            Queue<int> input = new Queue<int>(Console.ReadLine().Split().Select(int.Parse));
            int number = 0;

            Queue<int> evenNum = new Queue<int>();
            while (input.Any())
            {
               number =  input.Peek();
                if (number % 2 == 0)
                {

                    evenNum.Enqueue(number);
                    input.Dequeue();
                }
                else
                {
                    input.Dequeue();
                }

            }
            Console.WriteLine(string.Join(", ",evenNum));
        }

    }
}