RosettaCodeData/Task/Balanced-brackets/C-sharp/balanced-brackets-2.cs

                       // simple solution
                       string input = Console.ReadLine();
            if (input.Length % 2 != 0)
            {
                Console.WriteLine("Not Okay");
                return;
            }
            for (int i = 0; i < input.Length; i++)
            {
                if (i < input.Length - 1)
                {
                    if (input[i] == '[' && input[i + 1] == ']')
                    {
                        input = input.Remove(i, 2);
                        i = -1;
                    }
                }

            }
            if (input.Length == 0)
                Console.WriteLine("Okay");
            else
                Console.WriteLine("Not Okay");