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: Barry was a spy operating in Germany. Sentence 2: He slipped a note under a bench. Sentence 3: When he came back the next day, the note was still there. Sentence 4: Barry was confused, his accomplice hadn't discovered it. Sentence 5: Barry flew back home to US, realizing he was a lousy spy. Choices: a. The Spy Who Came In From The Cold. b. The broken sidewalk.

a