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:
a breed is a domesticated race or type of an animal or plant.

Ex Output:
breed


Ex Input:
mpika district is a district of zambia in the northern province.

Ex Output:
mpika district


Ex Input:
patricia hill collins (born may 1, 1948) is a distinguished university professor of sociology at the university of maryland, college park.

Ex Output:

patricia hill collins