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:
lee bowyer (born 3 january 1977) is an english football player.

Ex Output:
lee bowyer


Ex Input:
euclid's lemma, also called euclid's division lemma or euclid's first theorem, is an important lemma.

Ex Output:
euclid's lemma


Ex Input:
"little red corvette" is a pop/rock song by musician prince.

Ex Output:

little red corvette