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'.

Example Input: Sentence 1: The police investigated the man. Sentence 2: They could not find anything illegal. Sentence 3: They followed him for a little bit. Sentence 4: He wondered who they were following. Sentence 5: The man was later found guilty. Choices: a. Not Guilty. b. Jazz Record.
Example Output: a

Example Input: Sentence 1: Greg was doing shopping. Sentence 2: He went into his local gas station. Sentence 3: While standing in line he see's a sign for lottery. Sentence 4: He decides to pick up a ticket. Sentence 5: Turns out it was the winning ticket. Choices: a. Greg wins big. b. Measure.
Example Output: a

Example Input: Sentence 1: Shery was invited to her cousin's wedding. Sentence 2: She rearranged her work schedule so she could attend the wedding. Sentence 3: She ran into her cousin at the mall the day before the wedding. Sentence 4: Her cousin was upset that Shery hadn't come to the wedding. Sentence 5: Shery had written down the wrong date, she felt awful. Choices: a. Book. b. Big Mistake.
Example Output:
b