from functools import total_ordering

@total_ordering
class Person:
    def __init__(self, first, last):
        self.first_name, self.last_name = first, last
    def __eq__(self, other):
        return (self.first_name, self.last_name) == (other.first_name, other.last_name)
    def __lt__(self, other):
        if self.last_name < other.last_name:
            return True
        elif other.last_name < self.last_name:
            return False
        elif self.first_name < other.first_name:
            return True
        else:
            return False