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: a commode is a special piece of furniture.
Example Output: commode

Example Input: terry and june is a british sitcom that was shown on bbc one from 1979 until 1987.
Example Output: terry and june

Example Input: robert ii of france (march 27, 972 - july 20, 1031) was born in orleans, france.
Example Output:
robert ii of france