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: chen zhongshi (; august 1942 – 29 april 2016) was a chinese author.
Example Output: chen zhongshi

Example Input: songkran is a festival held every year in thailand on april 13.
Example Output: songkran

Example Input: bruno kirby (born giovanni quidaciolu jr.; april 28, 1949 – august 14, 2006) was an american actor, singer, voice artist, chef, and comedian.
Example Output:
bruno kirby