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 operator of Apollo 12 was NASA.
Example Output: Apollo 12

Example Input: "inside man was written by Matt Wayne.
Example Output: inside man

Example Input: In 1999 Marvin Steve won the Men's singles of the Croatian International.
Example Output:
1999