from turtle import * 

def initturtle():
	reset()
	color('blue')
	speed('fastest')
	tracer(False)

def graphstring(str):
	for char in str:
		if char == 'F':
			forward(100)
		if char == '-':
			left(90)

initturtle()
graphstring('F-F-F-F-')

raw_input("Press return to continue...\n")