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.

Ex Input:
the temple of athena nike is a temple on the acropolis of athens.

Ex Output:
temple of athena nike


Ex Input:
waiting for guffman is a musical mockumentary movie made in 1997.

Ex Output:
waiting for guffman


Ex Input:
the "second lady of the united states" is the wife of the vice president of the united states.

Ex Output:

second lady of the united states