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: Mark had lost his dog over a month ago. Sentence 2: He missed his dog very much. Sentence 3: One evening while mowing the lawn he notices something. Sentence 4: He sees a dog in the street that looked like his lost dog. Sentence 5: It turns out to be his lost dog who had returned home.

Mark's dog returns