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

namespace exr_01_matrix
{
    class Program
    {
        static void Main(string[] args)
        {
            int a = int.Parse(Console.ReadLine());
            int b = int.Parse(Console.ReadLine());
            int c = int.Parse(Console.ReadLine());
            int d = int.Parse(Console.ReadLine());

            for (int i = a; i <= b; i++)
            {
                for (int ii = a; ii <= b; ii++)
                {
                    if (i != ii)
                    {
                        for (int iii = c; iii <= d; iii++)
                        {
                            for (int iiii = c; iiii <= d; iiii++)
                            {
                                if (iii != iiii)
                                {
                                    if (i + iiii == ii + iii)
                                    {
                                        Console.WriteLine("" + i + ii);
                                        Console.WriteLine("" + iii + iiii);
                                        Console.WriteLine();
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}