IPerson p1 = new Person("Ivan");
string name = p1.GetName();
Console.WriteLine(name); // Ivan

// ---------------------------------

Person p2 = new Person("Ivan");
Console.WriteLine(p2); // Ivan

// ---------------------------------

IStudent student1 = new Student("Ivan", "Harvard");
student1.AddCourse("Mathematics");
student1.AddCourse("Literature");
Console.WriteLine(student1);
// Ivan, Harvard
// Mathematics, Literature