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:
love hina is a japanese manga.

Ex Output:
love hina


Ex Input:
a viola is a musical instrument which is similar to the violin and cello.

Ex Output:
viola


Ex Input:
all we know is falling is the first album of the band paramore.

Ex Output:

all we know is falling