using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _1._3.Merging_Lists
{
    class Program
    {
        static void Main()
        {
            List<int> firstInput = Console.ReadLine().Split().Select(int.Parse).ToList();
            List<int> secondInput = Console.ReadLine().Split().Select(int.Parse).ToList();

            int counter = 0;

            if (firstInput.Count > secondInput.Count)
            {
                counter = firstInput.Count;
            }
            else
            {
                counter = secondInput.Count;
            }

            List<int> endResult = new List<int>();

            for (int i = 0; i < counter; i++)
            {
                if (i < firstInput.Count)
                {
                    endResult.Add(firstInput[i]);
                }
                if (i < secondInput.Count)
                {
                    endResult.Add(secondInput[i]);
                }
            }
            Console.WriteLine(string.Join(" ", endResult));
        }
    }
}