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:
yoshihiro uchimura (born 24 august 1984) is a japanese football player.

Ex Output:
yoshihiro uchimura

Ex Input:
the genovese crime family is one of the "five families" that controls organized crime activities in new york city, within the nationwide criminal phenomenon known as the mafia (or cosa nostra).

Ex Output:
genovese crime family

Ex Input:
ashwin sundar (27 july 1985 18 march 2017) was an indian race driver.

Ex Output:
ashwin sundar