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: Athens is located in the country of Greece.
Example Output: Athens

Example Input: The United States House of Representatives is the leader of Antioch, California.
Example Output: Antioch, California

Example Input: The Accademia di Architettura di Mendrisio is located in Switzerland.
Example Output:
Accademia di Architettura di Mendrisio