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: elizabeth cole (better known as elizabeth ashley; august 30 1939) is an american stage, television series and movie actress.
Example Output: elizabeth ashley

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

Example Input: leaf storm is a short story written by nobel prize-winning author gabriel garcía márquez.
Example Output:
leaf storm