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 ISBN number of Aenir is 0-439-17684-0.
Example Output: Aenir

Example Input: 1010 students are enrolled at Juanita.
Example Output: Juanita

Example Input: Paulo Sousa is the manager of the ACF Fiorentina.
Example Output:
ACF Fiorentina