#!/usr/bin/python

import sys

# ----------------------------------------------------------------
class Observable(dict):
    """
    A class of thing that can be observed.  When its notifyObservers()
    method is called with an event, it passes that event on to its
    observers.
    """

    def addObserver(self, event, observer):
        if self.has_key(event):
            self[event].append(observer)
        else:
            self[event] = [observer]

    def notifyObservers(self, event):
        if self.has_key(event):
            for observer in self[event]:
                observer.observeEvent(event)
    

# ----------------------------------------------------------------
class Observer(object):
    """
    A class of thing that observes an Observable.  The Observable will
    calls the Observer's observeEvent() method.
    """

    def __init__(self, name):
        self.name = name

    def observeEvent(self, event):
        sys.stdout.write('=== %s: "%s"\n' % (self.name, event))


# ----------------------------------------------------------------
class AnimalDetector(Observable):
    """
    This class notifies all its observers if a string contains a
    particular animal.
    """

    def detect(self, line):
        animals = ('goat', 'sheep', 'duck', 'horse', 'platypus')
        for a in animals:
            if line.find(a) != -1:
                self.notifyObservers(a)


# MAIN -----------------------------------------------------------

animalD = AnimalDetector()

alice = Observer('Alice')
bert = Observer('Bert')
chris = Observer('Chris')
dave = Observer('Dave')

# Notice how we have multiple observers looking for the same event in
# the following code. Also notice how the 'cow' event will never trigger
# for bert, because the AnimalDetector doesn't dispatch an event for
# cows!
animalD.addObserver('goat', alice)
animalD.addObserver('cow', bert)
animalD.addObserver('goat', bert)
animalD.addObserver('goat', chris)  # same as alice!
animalD.addObserver('platypus', chris)
animalD.addObserver('duck', dave)
animalD.addObserver('platypus', dave)

for line in iter(sys.stdin.readline, ""):  # iter/readline for line-buffering
    animalD.detect(line)