Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

Ex Input:
morsain is a commune.

Ex Output:
morsain


Ex Input:
the gates of the forest is a book written by nobel peace prize-winning author elie wiesel.

Ex Output:
the gates of the forest


Ex Input:
killing joke are an industrial rock band from england.

Ex Output:

killing joke