NineDigitNumbers_full_operated

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

namespace NineDigitNumbers
{
    class NineDigitNumbers
    {
        static void Main(string[] args)
        {
            uint sum = uint.Parse(Console.ReadLine());
            uint diff = uint.Parse(Console.ReadLine());

            int flag = 0;

            for (int a = 1; a <= 7; a++)
            {
                for (int b = 1; b <= 7; b++)
                {
                    for (int c = 1; c <= 7; c++)
                    {
                        for (int d = 1; d <= 7; d++)
                        {
                            for (int e = 1; e <= 7; e++)
                            {
                                for (int f = 1; f <= 7; f++)
                                {
                                    int first = int.Parse(a.ToString() + b.ToString() + c.ToString());
                                    int second = int.Parse(d.ToString() + e.ToString() + f.ToString());

                                    if (second - first == diff)
                                    {
                                        for (int g = 1; g <= 7; g++)
                                        {
                                            for (int h = 1; h <= 7; h++)
                                            {
                                                for (int i = 1; i <= 7; i++)
                                                {
                                                    if (a + b + c + d + e + f + g + h + i == sum)
                                                    {
                                                        int third = int.Parse(g.ToString() + h.ToString() + i.ToString());

                                                        if (third - second == diff && second - first == diff)
                                                        {
                                                            Console.WriteLine("{0}{1}{2}{3}{4}{5}{6}{7}{8}", a, b, c, d, e, f, g, h, i);
                                                            flag++;
                                                        }
                                                    }
                                                }
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }

            if (flag == 0)
            {
                Console.WriteLine("No");
            }
        }
    }
}