In this task, you're given the title of a five-sentence story, the first four sentences, and two options for the fifth sentence as a and b. Your job is to pick the sentence option that does not connect with the rest of the story, indicating your choice as 'a' or 'b'. If both sentences are plausible, pick the one that makes less sense.

Example Input: Title: Books. Sentence 1: The kids loved reading. Sentence 2: They bought a big stack of books. Sentence 3: They read each one before the end of the week. Sentence 4: They wanted more! Choices: a. Beth was proud of the work she'd done. b. Their mom took them to the library to get more things to read.
Example Output: a

Example Input: Title: The Teapot. Sentence 1: The girls were playing in their bedroom. Sentence 2: They had a big pink teapot. Sentence 3: They pretended to pour tea into each of their glasses. Sentence 4: Then they toasted to each other. Choices: a. They sipped the tea politely. b. It was great to finally see her dashing freely about the park!
Example Output: b

Example Input: Title: Buns are Tough. Sentence 1: Julia was trying to put her hair in a bun. Sentence 2: No matter what she did she couldn't seem to get it right. Sentence 3: She scoured the internet for some useful advice. Sentence 4: Nothing seemed to work until finally she spotted something. Choices: a. She kicked it away and ran, luckily escaping the beast. b. Using a trick from a video, she finally managed to make her bun.
Example Output:
a