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

namespace ConsoleApplication6
{
    class Program
    {
        static void Main(string[] args)
        {

            int x=Convert.ToInt32(Console.ReadLine());
            int y = Convert.ToInt32(Console.ReadLine());
            string nes=Convert.ToString(x);
            string bla = Convert.ToString(y);
            int[] niz_a= new int[4];
                int[] niz_b = new int[4];
                 int i;
                 if(x<5000 && x>0)
            {
                for (i = 3; i >= 4; i--) {
                     niz_b[i] =x%10;
                    niz_a[i] = y % 10;
                    x = x / 10;
                    y = y / 10;
                }

                for (i= 0; i < 4; i++) {
                    Console.WriteLine(niz_a[i]);
                    Console.WriteLine(niz_b[i]);
                }
                Console.ReadLine();
            }

        }
    }
}