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: Martin looked up at the sky and saw a round object. Sentence 2: He screamed that it must be aliens. Sentence 3: He ran around alerting his neighbors. Sentence 4: They looked up and saw a balloon stuck on some power lines. Sentence 5: Martin was very embarrassed and went inside and closed the door.

UFO