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: Wally had made a mistake. Sentence 2: He had kissed his neighbor. Sentence 3: He confessed this to his wife. Sentence 4: She made him sleep on the couch. Sentence 5: Wally would never forgive himself. Choices: a. The Affair. b. Grand Master.

a