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: corrosion is the breakdown of materials due to chemical reactions.

Output: corrosion


Input: Consider Input: "feeling good" (or "feelin' good") is a jazz ballad.

Output: feeling good


Input: Consider Input: toshiyasu takahara (born 18 october 1980) is a japanese football player.


Output: toshiyasu takahara