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: Marcus was collecting shells on the beach. Sentence 2: He picked up a large beautiful shell. Sentence 3: He put it in his pocket to save for later. Sentence 4: Suddenly he felt a sharp pinch. Sentence 5: A crab was inside the shell pinching his leg.

Crab in the Shell