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.

Example Input: Asherton, Texas is part of the United States.
Example Output: Asherton, Texas

Example Input: The American Journal of Mathematics is published bimonthly.
Example Output: American Journal of Mathematics

Example Input: Apollo 11 was operated by NASA.
Example Output:
Apollo 11