import turtle as t
s = 100
abel = t.Turtle()
for i in range(4):
abel.forward(s)
abel.left(90)
abel.left(45)
abel.forward(141)
abel.left(135)
abel.forward(s)
abel.left(135)
abel.forward(141)
abel.left(135)
abel.forward(s/2)
abel.left(90)
abel.forward(s)
abel.right(90)
abel.forward(s/2)
abel.right(90)
abel.forward(s/2)
abel.right(90)
abel.forward(s)