Exam 2. Hayvan Numbers

namespace _4.HayvanNumbers
{
    using System;

    public class HayvanNumbers
    {
        public static void Main(string[] args)
        {
            checked
            {
                int sum = int.Parse(Console.ReadLine());
                int diff = int.Parse(Console.ReadLine());

                bool isFoundNums = false;
                for (int a = 5; a <= 9; a++)
                {
                    for (int b = 5; b <= 9; b++)
                    {
                        for (int c = 5; c <= 9; c++)
                        {
                            int abcNum = (a * 100) + (b * 10) + c;
                            for (int d = 5; d <= 9; d++)
                            {
                                for (int e = 5; e <= 9; e++)
                                {
                                    for (int f = 5; f <= 9; f++)
                                    {
                                        int defNum = (d * 100) + (e * 10) + f;
                                        if (defNum - abcNum == diff)
                                        {
                                            for (int g = 5; g <= 9; g++)
                                            {
                                                for (int h = 5; h <= 9; h++)
                                                {
                                                    for (int i = 5; i <= 9; i++)
                                                    {
                                                        int ghiNum = (g * 100) + (h * 10) + i;
                                                        int sumDigits = a + b + c + d + e + f + g + h + i;
                                                        if (sumDigits == sum && ghiNum - defNum == diff)
                                                        {
                                                            Console.WriteLine("{0}{1}{2}", abcNum, defNum, ghiNum);
                                                            isFoundNums = true;
                                                        }
                                                    }
                                                }
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }

                if (!isFoundNums)
                {
                    Console.WriteLine("No");
                }
            }
        }
    }
}