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:
tatsuya kamohara (born 8 july 1983) is a japanese football player.

Ex Output:
tatsuya kamohara


Ex Input:
aerospace engineering is a field of engineering that specializes in vehicles that move in fluids.

Ex Output:
aerospace engineering


Ex Input:
graham chapman (8 january 1941 – 4 october 1989) was a british actor, comedian and writer.

Ex Output:

graham chapman


