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:
the jungle book is a collection of stories written by rudyard kipling.

Ex Output:
the jungle book


Ex Input:
bothnian bay (; ) is a bay in the northest of the gulf of bothnia.

Ex Output:
bothnian bay


Ex Input:
dune 2000 is a real-time strategy game released by westwood studios.

Ex Output:

dune 2000