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: ernest evans (born october 3, 1941) better known as chubby checker, is a pop singer from the united states.

Output: chubby checker


Input: Consider Input: james b. dudley high school in the town of greensboro, north carolina, where the agricultural and technical university is located, was named after dudley because of his work for his community.

Output: james b. dudley


Input: Consider Input: zirconium is a chemical elemental metal.


Output: zirconium