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:
central plaza is a skyscraper in hong kong.

Ex Output:
central plaza


Ex Input:
james b. dudley high school in the town of greensboro, north carolina, where the agricultural and technical university is located, was named after dudley because of his work for his community.

Ex Output:
james b. dudley


Ex Input:
gumi is the second largest city in gyeongsangbuk-do, south korea.

Ex Output:

gumi