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: Bernie was mowing the lawn. Sentence 2: The sky grew dark with rain clouds. Sentence 3: Bernie heard the tornado sirens go off. Sentence 4: He went inside to the basement. Sentence 5: Bernie waited for the sirens to stop.

Tornado