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: When Niki was seven her parents got her a puppy named Bumper. Sentence 2: One day, while Nikki was at school, Bumper escaped their yard! Sentence 3: Niki's mom looked everywhere for Bumper. Sentence 4: Her mom had to leave to go to the school to pick up Niki. Sentence 5: When she got there, Niki and Bumper were waiting at the curb!

The Lost Dog