Rotate a coordinate around point (0,0).
    - x and y specify the coordinate.
    - degree is a number from 0 to 360.
    Returns a new coordinate.

def rotate(x, y, degree):
    """Rotate a coordinate around point (0,0).
    - x and y specify the coordinate.
    - degree is a number from 0 to 360.
    Returns a new coordinate.
    """
    radian = float(degree) * 2 * math.pi / 360.0
    newx = math.cos(radian) * x - math.sin(radian) * y
    newy = math.sin(radian) * x + math.cos(radian) * y
    return (newx, newy)