class Parallellogram (object):
    def __init__ (self, a, b, h):
        self.kant = a
        self.basKant = b
        self.hojd = h
        
    def area (self):
        return self.hojd * self.basKant

    def omkrets (self):
        return 2 * (self.kant + self.basKant)

class Rektangel (Parallellogram):
    def __init__ (self, a, b):
        self.kant = a
        self.basKant = b

    def area (self):
        return self.kant * self.basKant