class Point(object):
    def __init__(self, x, y):
        self.x = x
        self.y = y
    def distanceTo(self, other):
        return abs(self.x - other.x) + abs(self.y - other.y)

class Line(object):
    def __init__(self, p1, p2):
        self.p1 = p1
        self.p2 = p2
    def length(self):
        return self.p1.distanceTo(self.p2)