class Rectangle():
    recs = []
    def __init__(self, w, l):
        self.width = w
        self.len = l
        self.recs.append(self.width,
                        self.len)

    def print_size(self):
        print("{} by {}".format(self.width,
                                self.len))
r1 = Rectangle(10, 20)
r2 = Rectangle(11, 35)
r3 = Rectangle(29, 30)
print(Rectangle.recs)