In this task you are given a sentence. You must judge whether subject of the main clause is singular or plural. Label the instances as "Singular" or "Plural" based on your judgment.

Example Input: The Author holds exclusive rights to this work.
Example Output: Singular

Example Input: Her tutor never even knew the difference.
Example Output: Singular

Example Input: A devilish smile twisted Robert's lips.
Example Output:
Singular