class Osoba:
    def __init__(self, name, last_name, age):
        self.name = name
        self.last_name = last_name
        self.age = age

    def get_name(self):
        return self.name

    def get_last_name(self):
        return self.last_name

    def get_age(self):
        return self.age

class Note:
    def __init__(self, grades):
        self.grades = grades

    def get_grades(self):
        return self.grades

    def get_grade(self, subject):
        return self.grades.get(subject, None)

class Student(Osoba):
    def __init__(self, name, last_name, age, index_nr, grades):
        super().__init__(name, last_name, age)
        self.index_nr = index_nr
        self.notes = Note(grades)

    def get_index_nr(self):
        return self.index_nr

    def get_notes(self):
        return self.notes.get_grades()

class Group:
    def __init__(self):
        self.students = []

    def add_student(self, student):
        self.students.append(student)

    def get_students(self):
        return self.students

    def display_students(self):
        for student in self.students:
            print(f"Student: {student.get_name()} {student.get_last_name()}, Age: {student.get_age()}, Index: {student.get_index_nr()}")
            print(f"Grades: {student.get_notes()}")

# Przykładowa inicjalizacja studentów
grades_student1 = {
    "Mathematics": 5,
    "Physics": 4,
    "Chemistry": 3
}

grades_student2 = {
    "Mathematics": 4,
    "Physics": 5,
    "Chemistry": 4
}

student1 = Student("Anna", "Nowak", 22, "2021001", grades_student1)
student2 = Student("Piotr", "Kowalski", 23, "2021002", grades_student2)

# Przykładowa inicjalizacja grupy z dowolnymi studentami
group = Group()
group.add_student(student1)
group.add_student(student2)

# Wyświetlenie studentów w grupie
group.display_students()