Programming Assignment #5: Turtle Graphics

This programing assignment is explained on page 251 of your book in exercise 6.23. Instead of the book's commands, though, use the following commands: 
Command				Meaning
---------			------------
up				Pen up
penup				Pen up
pen up				Pen up
u				Pen up
down				Pen down
pendown				Pen down
pen down			Pen down
d				Pen down
right				Turn right
turn right			Turn right
left				Turn left
turn left			Turn left
10				Forward 10
forward 20			Forward 20
f 30				Forward 30
f40				Forward 40
print				Print screen
show				Print screen
end				End program
quit				End program
All commands should be case-insensitive. You don't have to write any turtle graphics programs yourself.

For extra credit, you can implement: