from turtle import *
tracer(0)
r = 20
for i in range(2):
    fd(15*r)
    lt(90)
    fd(20*r)
    lt(90)
up()
rt(90)
bk(7*r)
lt(90)
fd(9*r)
down()
for i in range(2):
    fd(17*r)
    rt(90)
    fd(15*r)
    rt(90)
up()
for x in range(-50,50):
    for y in range(-50,50):
        goto(x*r, y*r)
        dot(3,'red')
update()