static void Main(string[] args)
{
var s = new Student("Alex", new Knowledge(5));
University university = new University("CH.U.I.");
university.AddStudent(new Student("Andrew Kostenko", new Knowledge(4)));
university.AddStudent(new Student("Julia Veselkina"));
university.AddStudent(new Student("Maria Perechrest"));
university.AddStudent(s);
Internship internship = new Internship("Interlink");
//internship.AddStudents(university.Students);
internship.AddStudentsFromOtherEducPlace(university); // поліморфізм
Console.WriteLine("List of internship's students:");
Console.WriteLine(internship.GetStudents());
}