Write a C$++$ program that defines a class Rectangle with the following specifications:

Private members for storing the length and width of a rectangle.

A public constructor that initializes the length and width to values provided by the user.

A public member function area$()$ that calculates and returns the area of the rectangle.

A public member function perimeter$()$ that calculates and returns the perimeter of the rectangle.

A public member function isSquare$()$ that returns true if the rectangle is a square $($i$.$e$.,$ length and width are equal$)$ and false otherwise.

Write a main$()$ function to create an object of Rectangle, take user input for the length and width, and then display the area, perimeter, and whether the rectangle is a square.