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: A group of explorers entered a cave. Sentence 2: They heard a lot of screaming. Sentence 3: They didn't know what it was. Sentence 4: They saw things flying around. Sentence 5: They realized they were bats.

Bat Cave