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: Antonis Milionis is chairman of A.E Dimitra Efxeinoupolis.
Example Output: A.E Dimitra Efxeinoupolis

Example Input: An ingredient of Ajoblanco is garlic.
Example Output: Ajoblanco

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