Student Marks Data Abstraction

Implement a Python class that demonstrates data abstraction for a student's marks.

Create a Student class with:

• __init__(self, name): stores the student's name and initializes marks as unset.
• setMarks(self, marks): sets the student's marks only if marks is between 0 and 100 inclusive and returns them. If the value is invalid, return -1.
• getMarks(self): returns the currently stored marks. If marks have not been set yet, return -1.

Notes:

• Use a private attribute for marks.
• Do not validate the student name.

Examples:

• Student('Asha'), then setMarks(85), then getMarks() returns 85
• Student('Asha'), then setMarks(120) returns -1