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:
a dipole speaker is a type of a loudspeaker.

Ex Output:
dipole speaker


Ex Input:
leslie grantham (30 april 1947 – 15 june 2018) was a british actor and convicted murderer.

Ex Output:
leslie grantham


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

Ex Output:

malleray