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: Better Cardio. Sentence 1: Tom constantly ran out of breath. Sentence 2: He decided to fix it by joining a marathon. Sentence 3: Tom trained hard for it every day. Sentence 4: He was able to finish it when the day came. Choices: a. Tom's cardio improved a great deal. b. His dog was licking his lips and chewing pieces of food.
Example Output: b

Example Input: Title: Leftovers. Sentence 1: Tom was really hungry at night. Sentence 2: He didn't want to cook anything new. Sentence 3: He found some leftovers from a restaurant. Sentence 4: They were a few days old but Tom heated them up anyway. Choices: a. Mary was killed after the microwave caught fire and burned the house. b. They tasted better than expected.
Example Output: a

Example Input: Title: Fail. Sentence 1: Anna was so excited to take her road test. Sentence 2: She could not wait to get her license! Sentence 3: But she failed her test! Sentence 4: Anna was devastated. Choices: a. Anna grew to love college quickly! b. She knew she had to get more practice!
Example Output:
a