import turtle
a=turtle.Pen()
b=turtle.Pen()
c=turtle.Pen()
d=turtle.Pen()

a.forward(100)
b.forward(100)
c.forward(120)
d.forward(120)
a.left(90)
c.left(90)
b.right(90)
d.right(90)
a.forward(120)
b.forward(120)
c.forward(100)
d.forward(100)
b.left(90)
d.left(90)
a.right(90)
c.right(90)
a.forward(120)
b.forward(120)
c.forward(100)
d.forward(100)