Write a Python program that shows a turtle walking back and forth between two vertical walls. Please do the following:

* Create a 800 X 600 Turtle Graphics window

* Draw a vertical line at x-coordinate = -300. The y-coordinates of the two end points are 200 and -200, respectively.

* Draw another vertical line at x-coordinate = 300. The y-coordinates of the two end points are 200 and -200, respectively.

* Create a turtle object and change the shape from arrowhead to turtle.

* Use a loop to make the turtle walk 2000 steps, one step at a time. Whenever the turtle hits a wall, turn it 180 degrees and have it continue to walk.