Bits Inverter Two

using System;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;

class Program
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        int step = int.Parse(Console.ReadLine());
        //string[] nNumbers = new string[n];

        var binNumber = "";
        for (int i = 0; i < n; i++)
        {
            //nNumbers[i] = Convert.ToString(int.Parse(Console.ReadLine()), 2);
            //if (nNumbers[i].Length < 8)
            //{
            //    string zero = new String('0', 8 - nNumbers[i].Length);
            //    nNumbers[i] = zero + nNumbers[i];
            //}
            binNumber += Convert.ToString(int.Parse(Console.ReadLine()), 2).PadLeft(8, '0');
        }
        char[] binArray = binNumber.ToCharArray();
        for (int i = 0; i < binArray.Length; i += step)
        {
            if (binArray[i] == '0')
            {
                binArray[i] = '1';
            }
            else
            {
                binArray[i] = '0';
            }
        }

        for (int j = 0; j < binArray.Length; j += 8)
        {
            string strResult = string.Join("", binArray.Skip(j).Take(8));
            int intResult = Convert.ToInt32(strResult, 2);
            Console.WriteLine(intResult);
        }
    }
}