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:
kurt julius isselbacher (september 12, 1925 – july 18, 2019) was a german-born american physician and gastroenterologist.

Ex Output:
kurt julius isselbacher


Ex Input:
cape hatteras is a cape on the coast of north carolina.

Ex Output:
cape hatteras


Ex Input:
mario kempes (born 15 july 1954) is a former argentine football player.

Ex Output:

mario kempes