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: Sentinels guarding the armory are unresponsive. "
Example Output: Plural

Example Input: An old-school fuel gauge on the handlebars informed him that he had half a tank of petrol.
Example Output: Singular

Example Input: Many travel facts had never heard anyone, already climbed on board, questioning the decision to leave.
Example Output:
Plural