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 planes were overhead.
Example Output: Plural

Example Input: The back yard was essentially a long sweeping lawn with pockets of ruddy sand dunes and rocks running into the wild ocean.
Example Output: Singular

Example Input: Sadness swelled in the room, a thickness that made my skin crawl with goose bumps.
Example Output:
Plural