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: The population of Guangzhou's urban area is 11,070,654.
Example Output: Guangzhou

Example Input: The Château du Plessis-Bourré is privately owned.
Example Output: Château du Plessis-Bourré

Example Input: Alan Bean retired on June 1981.
Example Output:
Alan Bean