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: Serena was shopping at the mall all day. Sentence 2: She was about to leave when she realized that her wallet was missing. Sentence 3: She rushed inside and began searching everywhere for it. Sentence 4: Soon the mall had closed before she could find it. Sentence 5: She had to wait the entire weekend to get her wallet back. Choices: a. The Lost Wallet. b. The New School.

a