---

from turtle import *

def square(x, y, a, c):
    penup()
    goto(x, y)
    pendown()
    fillcolor(c)
    begin_fill()
    for i in range(4):
        forward(a)
        left(90)
    end_fill()

speed(0)

a = 40

for i in range(8):
    for j in range(8):
        if (i + j) % 2 == 0:
            c = "white"
        else:
            c = "black"
        square(-160 + j * a, -160 + i * a, a, c)

done()