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: nexon corporation is a korean gaming corporation and developer of online games and mmorpgs.
Example Output: nexon

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

Example Input: electoral fraud or vote rigging is any alteration or changing the vote count in election.
Example Output:
electoral fraud