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: ambleteuse is a commune.

Output: ambleteuse


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

Output: rsgc1


Input: Consider Input: bbc one is a television channel in the united kingdom.


Output: bbc one