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: børge rosenbaum (3 january 1909 – 23 december 2000), known professionally as victor borge , was a danish-american comedian, conductor, and pianist.
Example Output: victor borge

Example Input: yuan baohua (; 13 january 1916 – 9 may 2019) was a chinese economic official and academic administrator.
Example Output:
yuan baohua