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: Two brothers went walking on the beach. Sentence 2: They picked up a shell in the sand. Sentence 3: The youngest brother put it in his pocket. Sentence 4: He then felt a tickling feeling in his pocket. Sentence 5: He took out the shell and found a crab inside.

Beach surprise