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: island of the blue dolphins is an american book written for children by scott o'dell.

Output: island of the blue dolphins

Input: Consider Input: "canuck" is a slang term for canadian people.

Output: canuck

Input: Consider Input: gao xingjian (born january 4, 1940), is a chinese-french writer.
Output: gao xingjian