import turtle
t=turtle.Turtle()
s=turtle.Screen()
s.bgcolor('black')
t.pencolor('blue')
t.speed(0)
c=0
d=0
while True:
	for i in range(4):
		t.forward(80)
		t.right(90)
	t.right(15)
	c+=1
	if c>=390/15:
		t.forward(50)
		c=0
		d+=1
		if d>=12:
			break
t.hideturtle()
turtle.done()