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: "god defend new zealand" is one of the national anthems of new zealand.
Example Output: god defend new zealand

Example Input: adam lambert (born january 29, 1982 in indianapolis, indiana) is an american pop rock singer-songwriter.
Example Output:
adam lambert