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: Leo is walking down the street. Sentence 2: He sees a thief swipe an old lady's purse. Sentence 3: Leo runs after the thief. Sentence 4: He catches the thief. Sentence 5: He returns the purse back to the lady.

Leo to the rescue