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:
joe the plumber, nickname of "samuel joseph "joe" wurzelbacher", (born december 3, 1973 in toledo, ohio) is an american commentator, motivational speaker and political activist.

Ex Output:
joe the plumber


Ex Input:
tornio ("") is a town in lapland, finland.

Ex Output:
tornio


Ex Input:
johnny test is a canadian–american animated series produced by warner bros.

Ex Output:

johnny test