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.

Ex Input:
The monitor's beeping dove from a constant beep to deep electronic thuds.

Ex Output:
Singular

Ex Input:
The calluses were back, courtesy of chopping wood, but his fingertips were still smooth.

Ex Output:
Plural

Ex Input:
Many professors here are leading experts in cancer study and are testing their own experimental drugs on patients.

Ex Output:
Plural