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 United States leader was called Joe Biden.
Example Output: United States

Example Input: Sweden won 2 medals in total
Example Output: Sweden

Example Input: 1634: The Galileo Affair was followed by 1634: The Ram Rebellion.
Example Output:
1634: The Galileo Affair