Definition: In this task, you're given five sentences, numbered 1 through 5. Your job is to generate a title for the story that makes complete sense. The title must be short, with less than three words, use simple language, and include the main topic of the story.
Input: Sentence 1: Tom got a book from the library. Sentence 2: He forgot to return it. Sentence 3: After a while Tom couldn't remember where he left the book. Sentence 4: Tom called the library to pay for it. Sentence 5: He was charged a small fee.

Lost Book