static void Main(string[] args)
        {
            Hospital     hospital     = new Hospital();
            Employee     employee     = new Employee();
            Doctor       doctor       = new Doctor();
            Nurse        nurse        = new Nurse();
            Receptionist receptionist = new Receptionist();
            Janitor      janitor      = new Janitor();
            Patient      patient      = new Patient();

            hospital.AddEmployees();
            hospital.AddPatients();
            hospital.MainMenu();

            bool inHospitalMenu = true;

            while (inHospitalMenu)
            {
                string userInput = Console.ReadLine().ToLower();


                switch (userInput)
                {
                case "a":
                    Console.Clear();
                    Console.WriteLine("The hospital employees are:");
                    Console.WriteLine();     //<-- Here to add some space btwn heading and list
                    hospital.ShowAllEmployees();
                    hospital.TasksOnEmployees();
                    break;

                case "r":
                    receptionist.CheckPhoneStatus();
                    break;

                case "j":
                    janitor.CheckSweepingStatus();
                    break;

                case "p":
                    employee.PayEmployee();
                    break;

                case "m":
                    Console.Clear();
                    hospital.MainMenu();
                    break;


                case "b":
                    Console.Clear();
                    Console.WriteLine("The hospital patients are:");
                    Console.WriteLine();     //<-- Here to add some space btwn heading and list
                    hospital.ShowAllPatients();
                    hospital.TasksOnPatients();
                    break;

                case "db":
                    Console.Clear();
                    hospital.ShowAllPatients();
                    hospital.DoctorDrawBloodforIndividualPatient();
                    Console.WriteLine("Your patients' new stats are:");
                    hospital.ShowAllPatients();
                    patient.ReturnToPatientList();
                    break;


                case "dc":
                    Console.Clear();
                    hospital.ShowAllPatients();
                    hospital.DoctorCareforIndividualPatient();
                    Console.WriteLine("Your patients' new stats are:");
                    hospital.ShowAllPatients();
                    patient.ReturnToPatientList();
                    break;

                case "nb":
                    Console.Clear();
                    hospital.ShowAllPatients();
                    hospital.NurseDrawBloodforIndividualPatient();
                    Console.WriteLine("Your patients' new stats are:");
                    hospital.ShowAllPatients();
                    patient.ReturnToPatientList();
                    break;


                case "nc":
                    Console.Clear();
                    hospital.ShowAllPatients();
                    hospital.NurseCareforIndividualPatient();
                    Console.WriteLine("Your patients' new stats are:");
                    hospital.ShowAllPatients();
                    patient.ReturnToPatientList();
                    break;


                case "c":
                    inHospitalMenu = false;
                    Console.WriteLine("GoodBye! Thanks for Visiting!");
                    break;

                default:
                    Console.WriteLine("Invalid Entry. Please Try Again!");
                    break;
                }
            }
        }