class Time(object):
    def __init__(self, hour, min):
        self.hour = hour
        self.min = min

    def __str__(self):
        """overloading the str operator (STRing)"""
        return f"[ {self.hour:2d}:{self.min:02d} ]"

    def __repr__(self):
        """overloading the repr operator (REPResentation)"""
        return f"Time({self.hour:2d}, {self.min:02d})"

    def __gt__(self, other):
        """overloading the GreaterThan operator"""
        selfminutes = self.hour * 60 + self.min
        otherminutes = other.hour * 60 + other.min
        return selfminutes > otherminutes

    def __add__(self, other):
        hour = self.hour + other.hour
        minute = self.min + other.min
        while minute > 60:
            minute = minute - 60
            hour = hour + 1
        while hour > 24:
            hour = hour - 24
        return self.__class__(hour, minute)


class TimeUK(Time):
    """Derived (or inherited class)"""

    def __str__(self):
        """overloading the str operator (STRing)"""
        if self.hour < 12:
            ampm = "am"
        else:
            ampm = "pm"

        return f"[{self.hour:2}:{self.min:02}{ampm}]"


if __name__ == "__main__":
    t1 = Time(11, 45)
    t2 = TimeUK(10, 20)
    print(t1, t2)
    print(f"The sum of t1 and t2 is {t1+t2}.")