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: rougefay is a commune.

Output: rougefay


Input: Consider Input: hiragana are part of the japanese writing system.

Output: hiragana


Input: Consider Input: the river clyde (, ]) is a river in scotland.


Output: river clyde