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: Massimo Drago played for S.S.D. Potenza Calcio.
Example Output: Massimo Drago

Example Input: O.C. performed Story.
Example Output: Story

Example Input: The runway length of Adolfo Suárez Madrid–Barajas Airport is 3,500.
Example Output:
Adolfo Suárez Madrid–Barajas Airport