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:
stenungsund is an urban area in the county of västra götaland in sweden.

Ex Output:
stenungsund


Ex Input:
an air raid is an attack in which bombs are dropped from aircraft on to a ground or sea target.

Ex Output:
air raid


Ex Input:
chevvy pennycook (born 6 april 1987 in bristol, england) is a rugby union player for bristol rugby in the guinness premiership.

Ex Output:

chevvy pennycook