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:
chumbawamba were a british alternative rock group.

Ex Output:
chumbawamba


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

Ex Output:
the jungle book


Ex Input:
the inupiat language is closely related to inuit languages of canada and greenland.

Ex Output:

inupiat language