class Zoo:
    """
        Class for Zoo object.
    """
    def __init__(self, name):
        """ Initialize the Zoo object. """
        # name of the Zoo
        self.name = name
        # we are using dictionaries for animals and personnel
        self.animals = {}
        self.zookeepers = {}

    def add_animal(self, animal):
        """ Adds an animal to the zoo. """
        # we use animal's name as a key in the dictionary
        name = animal.get_name()
        self.animals[name] = animal

    def add(self, animal):
        """ Shorter name of function to add animals to the Zoo. """
        self.add_animal(animal)

    def get_animals(self):
        """ Return all animals in the zoo."""
        return self.animals

    def remove(self, name):
        """ Remove animal from the Zoo for given name. If the name does not exist, error is printed. """
        if name in self.animals:
            # yes, animal with given name is in the Zoo
            del self.animals[name]
        else:
            print("Animal with given name is not in", self.name, "Zoo.")

    def get_animal_names(self, sort=False):
        """ Return animal names in the Zoo. Return sorted names if parameters sorted==True"""
        names = []
        
        for key in self.animals.keys():
            # get animal names and store them into list
            names.append(self.animals[key].get_name())

        if sort == True:
            # we have to return sorted names; so sort the names
            names = sorted(names)

        return names

    def number_animals(self):
        """ Return number of animals in the Zoo."""
        return len(self.animals)

    def total_area(self):
        """ Return the total Zoo area to host all animals defined in the object. """
        area = 0

        for key in self.animals:
            # get area for all animals in the zoo
            area += self.animals[key].get_required_area()

        return area

    def add_person(self, person):
        """ Adds a person to the zoo. """
        # we use person's name as a key in the dictionary
        name = person.get_name()
        self.zookeepers[name] = person

    def number_zookeepers(self):
        """ Return number of zookeepers in the zoo."""
        return len(self.zookeepers)

    def get_zookeepers(self):
        """ Return zookeepers in the zoo."""
        return self.zookeepers

    def get_person_names(self, sort=False):
        """ Return personnel names in the Zoo. Return sorted names if parameters sorted==True."""
        names = []
        
        for key in self.zookeepers.keys():
            # get persons names and store them into list
            names.append(self.zookeepers[key].get_name())

        if sort == True:
            # we have to return sorted names; so sort the names
            names = sorted(names)

        return names