zadacha 5 test

using System;

public class Program
{
    public static void Main()
    {
        int a = int.Parse(Console.ReadLine());
        int b = int.Parse(Console.ReadLine());
        for(char A = (char)a; A <= 'z' ; A++)
        {
            for(char B = (char)b; B <= 'z' ; B++)
            {
                for(int x = 1; x <=9; x++)
                {
                    for(int y = 1; y <=9; y++)
                    {
                        if(x + y == 9 && B > A)
                        {
                            Console.Write("{0}{1}{2}{3} ", A, B, x, y );
                        }
                    }
                }
            }
        }
    }
}