Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

Example Input: saint-paul-de-vence is a commune.
Example Output: saint-paul-de-vence

Example Input: rupert thorne is a fictional batman character, who is the crime boss of batman.
Example Output: rupert thorne

Example Input: a bite is a wound received from the teeth of an animal.
Example Output:
bite