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: I found a copy of Girl on a Train in a recycle bin. Sentence 2: I put it up on Amazon and sold it immediately for $5. Sentence 3: I listed it twice in error and got another sale. Sentence 4: I did not have a second copy of the book. Sentence 5: Although I lost money, I drop shipped the book. Choices: a. Girl on a Train. b. Headache.

a