from turtle import *

def draw_square(side_length):
    forward(side_length)
    left(90)
    forward(side_length)
    left(90)
    forward(side_length)
    left(90)
    forward(side_length)
#    left(90)


pensize(5)
pencolor("blue")
#draw_square(10)
#draw_square(20)
#draw_square(30)
#draw_square(40)
speed(0)
# General form for range:
# range(start, end, step)

for sidelen in range(10, 700, 10):
    draw_square(sidelen)

pencolor("red")
for sidelen in range(15, 700, 10):
    draw_square(sidelen)


input("hi")