import turtle
wn = turtle.getscreen()
wn.bgcolor("black")
s = turtle.Turtle()

for i in range(4):
    s.begin_fill()
    s.forward(100)
    s.left(90)
    s.pencolor("red")
    s.forward(100)
    s.fillcolor("red")
    s.end_fill()

for i in range(4):
    s.begin_fill()
    s.forward(90)
    s.left(90)
    s.pencolor("green")
    s.forward(90)
    s.fillcolor("green")
    s.end_fill()

for i in range(4):
    s.begin_fill()
    s.forward(80)
    s.left(90)
    s.pencolor("yellow")
    s.forward(80)
    s.fillcolor("yellow")
    s.end_fill()

for i in range(4):
    s.begin_fill()
    s.forward(70)
    s.left(90)
    s.pencolor('brown')
    s.forward(70)
    s.fillcolor("brown")
    s.end_fill()

for i in range(4):
    s.begin_fill()
    s.forward(60)
    s.left(90)
    s.pencolor("white")
    s.forward(60)
    s.fillcolor("white")
    s.end_fill()

for i in range(4):
    s.begin_fill()
    s.forward(50)
    s.left(90)
    s.pencolor("blue")
    s.forward(50)
    s.fillcolor("blue")
    s.end_fill()

for i in range(4):
    s.begin_fill()
    s.forward(40)
    s.left(90)
    s.pencolor("pink")
    s.forward(40)
    s.fillcolor("pink")
    s.end_fill()

for i in range(4):
    s.begin_fill()
    s.forward(30)
    s.left(90)
    s.pencolor("cyan")
    s.forward(30)
    s.fillcolor("cyan")
    s.end_fill()

for i in range(4):
    s.begin_fill()
    s.forward(20)
    s.left(90)
    s.pencolor('purple')
    s.forward(20)
    s.fillcolor("purple")
    s.end_fill()

for i in range(4):
    s.begin_fill()
    s.forward(10)
    s.left(90)
    s.pencolor("lime")
    s.forward(10)
    s.fillcolor("lime")
    s.end_fill()
