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:
skagit valley is a valley in washington in the united states.

Ex Output:
skagit valley


Ex Input:
central plaza is a skyscraper in hong kong.

Ex Output:
central plaza


Ex Input:
gomez formed her band selena gomez & the scene after signing a recording contract with hollywood records in 2008; they released the studio albums "kiss & tell" (2009), "a year without rain" (2010), and "when the sun goes down" (2011) before beginning a hiatus in 2012.

Ex Output:

selena gomez