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:
david evan mcmullin (born on april 2, 1976) is a former cia operations officer and independent presidential candidate.

Ex Output:
evan mcmullin


Ex Input:
valbirse is a new municipality of the administrative district of jura bernois in the canton of berne in switzerland.

Ex Output:
valbirse


Ex Input:
perceneige is a commune.

Ex Output:

perceneige