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: strawberry shortcake is a doll.

Output: strawberry shortcake

Input: Consider Input: le theil-en-auge is a commune.

Output: le theil-en-auge

Input: Consider Input: a red supergiant star is a larger and brighter type of red giant star.
Output: red supergiant star