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: mae west (august 17, 1893 – november 22, 1980) was an american actress and movie star.

Output: mae west


Input: Consider Input: aerospace engineering is a field of engineering that specializes in vehicles that move in fluids.


Output: aerospace engineering