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

namespace Substitute
{
    class Program
    {
        static void Main(string[] args)
        {
            int first = int.Parse(Console.ReadLine());
            int second = int.Parse(Console.ReadLine());

            int third = int.Parse(Console.ReadLine());
            int fourth = int.Parse(Console.ReadLine());

            var counter = 0;

            for (int firstNumber = first; firstNumber <= 8; firstNumber++)
            {
                for (int secondNumber = 9; secondNumber >= second; secondNumber--)
                {
                    for (int thirdNumber = third; thirdNumber <= 8; thirdNumber++)
                    {
                        for (int fourthNumber = 9; fourthNumber >= fourth; fourthNumber--)
                        {
                            bool isFirstEven = firstNumber % 2 == 0;
                            bool isSecondOdd = secondNumber % 2 == 1;
                            bool isThirdEven = thirdNumber % 2 == 0;
                            bool isFourtOdd = fourthNumber % 2 == 1;

                            if (isFirstEven && isSecondOdd && isThirdEven && isFourtOdd)
                            {
                                if (firstNumber == thirdNumber &&
                                    secondNumber == fourthNumber)
                                    Console.WriteLine("Cannot change the same player.");
                                else
                                {
                                    Console.WriteLine($"{firstNumber}{ secondNumber} - {thirdNumber}{ fourthNumber}");
                                    counter++;
                                }
                                if (counter == 6)
                                {
                                    return;
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}