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: Frank was drinking a warm cup of coffee. Sentence 2: It was almost time for bed, but Frank felt relaxed. Sentence 3: His coffee was only decaf. Sentence 4: Then he checked the package and saw it had caffeine. Sentence 5: Suddenly, Frank grew very energetic and restless.

Caffeine