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: the bighorn sheep ("ovis canadensis") is a species of sheep.

Output: bighorn sheep


Input: Consider Input: isaac watts (17 july 1674 – 25 november 1748) was an english pastor, preacher, poet, and hymn writer.

Output: isaac watts


Input: Consider Input: izu province (伊豆国, izu-no kuni) was an old province of japan in the area of shizuoka prefecture on the island of on honshū.


Output: izu province