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: rsgc1 is a massive young open star cluster in the milky way galaxy.

Output: rsgc1


Input: Consider Input: gratibus is a commune.


Output: gratibus