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: yu gamdong (, ?

Output: yu gamdong

Input: Consider Input: the northumbrian smallpipes are a type of bagpipes from north east england.

Output: northumbrian smallpipes

Input: Consider Input: jeong mong-ju (, hanja:, 1337 - april 1392) was a korean goryo dynasty politician, writer, poet and thinker.
Output: jeong mong-ju