Definition: In this task, you're given five sentences, numbered 1 through 5, and two options a and b for possible titles for the story. Your job is to choose the title that better fits the story. Indicate your choice by 'a' or 'b'.
Input: Sentence 1: Adam lost his key one the walk home from school. Sentence 2: He was unhappy with his carelessness. Sentence 3: But making the same walk the next day, he spotted it! Sentence 4: It was laying on the sidewalk in plain view! Sentence 5: Adam was so glad he had found the key. Choices: a. Police Chase. b. Key.

b