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:
in organic chemistry, an epoxide is a molecule that has a ring with at least three atoms in total, two carbon atoms and one oxygen atom.

Ex Output:
epoxide


Ex Input:
the standard time in kazakhstan is neither utc+05:00 or utc+06:00.

Ex Output:

time in kazakhstan