using System;

namespace _06._Substitute
{
    class Program
    {
        static void Main(string[] args)
        {
            int firstDigitFirstNumber = int.Parse(Console.ReadLine());
            int secondDigitFirstNumber = int.Parse(Console.ReadLine());
            int firstDigitSecondNumber = int.Parse(Console.ReadLine());
            int secondDigitSecondNumber = int.Parse(Console.ReadLine());
            int counter = 0;

            for (int j = firstDigitFirstNumber; j <= 8; j++)
            {
                for (int k = 9; k >= secondDigitFirstNumber; k--)
                {
                    for (int l = firstDigitSecondNumber; l <= 8; l++)
                    {
                        for (int m = 9; m >= secondDigitSecondNumber; m--)
                        {
                            if ((((j % 2 == 0) && (l % 2 == 0) && (k % 2 != 0) && (m % 2 != 0))))
                            {
                                if (j + k != l + m && counter == 6)
                                {
                                    Console.WriteLine($"{j}{k} - {l}{m}");
                                }
                                else if (j + k == l + m && counter == 6)
                                {
                                    Console.WriteLine("Cannot change the same player.");
                                }
                                counter++;
                            }
                        }
                    }
                }
            }
        }
    }
}