from turtle import *

def square(side_length):
    forward(side_length)
    right(90)
    forward(side_length)
    right(90)
    forward(side_length)
    right(90)
    forward(side_length)
    right(90)
sizes = [20,40,60,80,100]
for size in sizes:
    square(size)
for size in sizes:
    square(20)
    penup()
    forward(40)
    pendown()
    input()