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 Q]: grand-corent is a commune.
[EX A]: grand-corent

[EX Q]: a video projector takes a video signal and projects the corresponding image on a screen using a lens system.
[EX A]: video projector

[EX Q]: saint-marcel-en-marcillat is a commune.
[EX A]:
saint-marcel-en-marcillat