from turtle import *


def board(side_length):
    "Out line of the board"
    sides = [side_length, side_length, side_length, side_length]
    for sides in sides:
        pensize(4)
        forward(sides)
        right(90)

def blue_coin(size):
    begin_fill()
    fillcolor('blue')
    circle(size)
    end_fill()

def red_coin(size):
    begin_fill()
    fillcolor('red')
    circle(size)
    end_fill()


def black_tile(size):
    "black tile first"
    repeat = [1, 2, 3, 4]
    for repeat in repeat:
        forward(size)
        right(90)