NineDigitMagicNumbers

//Hayvan often plays with numbers. His recent game was to play with 9-digit numbers and calculate their sums of digits, as well as to split them into triples with special properties. Help Hayvan to find a very special set of numbers called “Hayvan numbers”.
//Hayvan numbers are 9-digit numbers in format abcdefghi, such that their sub-numbers abc, def and ghi have a difference diff (ghi-def = def-abc = diff), their sum of digits is sum and abc < def < ghi, where each digit a, b, c, d, e, f, g, h and i is in range [5…9].
//Your task is to write a program to print all Hayvan numbers for given sum and diff in increasing order.
//Input
//•   The input data should be read from the console.
//•   The number sum stays at the first line.
//•   The number diff stays at the second line.
//The input data will always be valid and in the format described. There is no need to check it explicitly.
//Output
//The output should be printed on the console. Print Hayvan numbers matching given difference diff and given sum of digits sum, in increasing order, each at a separate line. In case no Hayvan numbers exits, print “No”.
//Constraints
//•   The number sum will be a positive integer number in the range [0…100].
//•   The number diff will be a positive integer number in the range [0…1000].
//•   Allowed working time for your program: 0.25 seconds.
//•   Allowed memory: 16 MB.


using System;

class NineDigitMagicNumber
{
    static void Main()
    {

        int sum = int.Parse(Console.ReadLine());
        int diff = int.Parse(Console.ReadLine());
        bool isNum = false;

        for (int i = 111; i <= 777; i++)
        {
            int abc = i;
            int def = abc + diff;
            int ghi = def + diff;

            if (ghi>777)
            {
                break;
            }
            string wholeNumber = "" + abc + def + ghi;
            if (wholeNumber.Contains("8")||wholeNumber.Contains("9")||wholeNumber.Contains("0"))
            {
                continue;
            }
            int targetSum = 0;
            for (int k = 0; k < wholeNumber.Length; k++)
            {
                targetSum += Convert.ToInt32(Convert.ToString(wholeNumber[k]));
            }
            if (targetSum==sum)
            {
                Console.WriteLine(wholeNumber);
                isNum = true;
            }
        }
        if (!isNum)
        {
            Console.WriteLine("No");
        }
    }
}