Instructions: 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: Tom was at the bank. Sentence 2: He was trying to fill out some papers. Sentence 3: Unfortunately the bank's pen was leaky. Sentence 4: It got all over Tom's hands. Sentence 5: The bank apologized profusely. Choices: a. Cat and Mouse. b. Leaky Pen.
Output:
b