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: Karen was really afraid of being in a shark attack. Sentence 2: Her friends invited her to a trip to the beach, but she was nervous. Sentence 3: Karen stayed up all night reading about sharks to prepare for the trip. Sentence 4: The next day, Karen went with her friends to the beach. Sentence 5: Karen had a good time and was not attacked by a shark. Choices: a. 911. b. Sharks!.
Example Output: b

Example Input: Sentence 1: Jill loved butter. Sentence 2: But she noticed that she was gaining weight. Sentence 3: So she made efforts to use less butter when she cooked. Sentence 4: But she couldn't resist it. Sentence 5: So she decided to eat just butter despite her weight. Choices: a. Buttery. b. New Wallpaper.
Example Output: a

Example Input: Sentence 1: Lucas looked into his mother's eyes. Sentence 2: He asked if she remembered him. Sentence 3: She said yes he was Lim, his brother. Sentence 4: Lucas sighed and left the nursing home. Sentence 5: He thought about the effects of Alzheimer's. Choices: a. Alzheimers. b. An Extra Assignment.
Example Output:
a