This task is about identifying the subject of a given sentence. The subject of a sentence is the person, place, or thing that is performing the action of the sentence. The subject represents what or whom the sentence is about. Each sentence in this task is guaranteed to contain a single subject. The input is a sentence and the output is the identified subject of that sentence.

Ex Input:
The name of the episode that aired originally on March 11, 1988 was "heather's monk.

Ex Output:
heather's monk


Ex Input:
The English language is used in the United States.

Ex Output:
United States


Ex Input:
The title of the episode directed by David Mamet was "sacrifice.

Ex Output:

sacrifice