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: Jessica and Manny were roommates. Sentence 2: They were also best friends. Sentence 3: They started to argue over household chores. Sentence 4: Manny decided to move out. Sentence 5: They were no longer friends. Choices: a. Roommates. b. Energy.
Example Output: a

Example Input: Sentence 1: Julie was shopping in her local grocery store. Sentence 2: She was waiting in line at the checkout stand. Sentence 3: When she was going to put her items on the belt a man groped her. Sentence 4: She let out a whelp and slapped the man behind her. Sentence 5: She complained to security and had the man arrested. Choices: a. Personal Space. b. Out of Bread.
Example Output: a

Example Input: Sentence 1: The family traveled to Ireland. Sentence 2: They saw an amazing, historic castle. Sentence 3: They roamed the halls and looked at every nook and cranny. Sentence 4: What a beautiful piece of history! Sentence 5: They felt very fortunate that they'd been able to take this trip. Choices: a. The Pets. b. The Castle.
Example Output:
b