You need to answer a given question containing a blank (_). Your answer must be one of the two objects mentioned in the question, for example "trophy" and "suitcase". Your answer must not contain a word that is not present in the question. Please don't use articles (e.g., the, a) before the answer.

Input: Consider Input: A boy in a house tries to put a big book on a shelf built for paperbacks. The book falls to the ground because the _ is too narrow.

Output: shelf


Input: Consider Input: Peggy filled the bathtub with hot water and bubbles but not salts, because the _ smelled awful.

Output: salts


Input: Consider Input: Beth decided that her son wouldn't go to preschool before starting kindergarten. The _ would be a waste of time and money.


Output: preschool