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 leader of Catalonia is Carles Puigdemont.
Example Output: Catalonia

Example Input: The International Covenant on Economic, Social and Cultural Rights was signed in 1977.
Example Output: International Covenant on Economic, Social and Cultural Rights

Example Input: Jan Duursema has won the Eisner Award.
Example Output:
Jan Duursema