public class Main
{
	public static void main(String[] args) 
	{
		Exercise ex = new Exercise("What is 4! ", 24);
	
		Student m = new Student("Mary");
		Grader h = new Grader("Helena");
	
		m.doExercise(ex,24);
		h.gradeExercise(ex);
	
		ex.displayResult();
	}
}