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: maicon douglas sisenando (born 26 july 1981) is a brazilian football player.

Output: maicon douglas sisenando


Input: Consider Input: yu gamdong (, ?

Output: yu gamdong


Input: Consider Input: defibrillation is the act of defibrillating the heart to treat the heart when it is not pushing blood because the heart muscle is not working in any pattern.


Output: defibrillation