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.

Input: Consider Input: 2ne1 is a pop group of female singers from south korea.

Output: 2ne1


Input: Consider Input: plumbaginaceae is a family of flowering plants are about 560 species in 10 genera found all over the world.

Output: plumbaginaceae


Input: Consider Input: seo jung-won (born 17 december 1970) is a south korean professional athlete.


Output: seo jung-won