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: grand-corent is a commune.
Example Output: grand-corent

Example Input: perceneige is a commune.
Example Output: perceneige

Example Input: lupita nyong'o (born 1983) is a kenyan actress and filmmaker.
Example Output:
lupita nyong'o