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:
anton rubinstein (born vikhvatinets 28 november 1829; died petershof 20 november 1894) was a russian pianist and composer.

Ex Output:
anton rubinstein

Ex Input:
shiri maymon (born may 17, 1981 in haifa, israel) is an israeli (pop) singer.

Ex Output:
shiri maymon