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 english cocker spaniel is a breed of dog.

Output: english cocker spaniel


Input: Consider Input: the wisconsin river is a river in the united states.

Output: wisconsin river


Input: Consider Input: the radiated tortoise is a type of tortoise.


Output: radiated tortoise