using System;

​

namespace ConsoleApp17

{

    class Program

    {

        static void Main(string[] args)

        {

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

            string[] arrFirst = new string[n];

            string[] arrSecond = new string[n];

             for (int i=0; < items.Length; i++)

                {

                string[] items = Console.ReadLine.Split(" ");

                if (i % 2 == 0)

                {

                    arrFirst[i] = items[0];

                    arrSecond[i] = items[1];

                }

                else

                {

                    arrFirst[i] = items[1];

                    arrSecond[i] = items[0];

                }

                Console.WriteLine(string.Join(" "),arrFirst));

                Console.WriteLine(string.Join(" "),arrSecond));

        }

    }

}

​

​