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:
yoshikazu goto (後藤 義一, goto yoshikazu, born february 20, 1964) is a japanese professional athlete.

Ex Output:
yoshikazu goto


Ex Input:
the artemision zeus is a greek bronze statue.

Ex Output:
artemision zeus


Ex Input:
the 1939–40 nhl season was the 23rd season for the national hockey league.

Ex Output:

1939–40 nhl season