static void Main()
        {
            //create 10 workers and 10 students
            List <Worker>  exampleWorkers  = Worker.CreateList(10);
            List <Student> exampleStudents = Student.CreateList(10);

            //sort them by grade and money earnt per hour
            Student.SortGrade(exampleStudents);
            Worker.SortMoneyPerHour(exampleWorkers);

            foreach (Student student in exampleStudents)
            {
                Console.WriteLine(student.ToString());
            }

            Console.WriteLine();

            foreach (Worker worker in exampleWorkers)
            {
                Console.WriteLine(worker.ToString());
            }
        }