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: 2ne1 is a pop group of female singers from south korea.
Example Output: 2ne1

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: werner rackwitz (3 december 1929 – 14 march 2014) was a german opera director and politician.
Example Output:
werner rackwitz