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.

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

Example Input: waiting for guffman is a musical mockumentary movie made in 1997.
Example Output: waiting for guffman

Example Input: mucus (mucous), or slime, is a slippery liquid.
Example Output:
mucus