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: Sam was excited go to shopping. Sentence 2: He had a coupon that gave him a great deal. Sentence 3: Sam got everything he wanted and went to pay. Sentence 4: The cashier gave him terrible news about the coupon. Sentence 5: It had just recently expired. Choices: a. Shopping. b. Expired Coupon.

b