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: Weak. Sentence 1: Rick's friends asked him to go bowling. Sentence 2: But he was reluctant because he was so weak. Sentence 3: He decided to go anyway and had a lot of fun. Sentence 4: But he noticed a slight pain in his back. Choices: a. And after he picked up another bowling ball, it became worse. b. He woke up feeling refreshed for work the next day.
Example Output: b

Example Input: Title: Footprints. Sentence 1: Roger Rumface had been following the footprints in the snow. Sentence 2: He was nearly frostbitten. Sentence 3: Suddenly he realized the footprints had ended in the middle of a field. Sentence 4: There were no others. Choices: a. If only Roger had realized they were the prints of a bird. b. We finally sat under huge beautiful tree and all had a wonderful time!
Example Output: b

Example Input: Title: Rax. Sentence 1: Jimmy had one job, to destroy the barracks. Sentence 2: Everyone pleaded with him to do it. Sentence 3: Alas, Jimmy was hardheaded, and would not listen. Sentence 4: Instead of destroying the barracks, Jimmy went to the jungle. Choices: a. Julia was terrified but luckily at their next check up it was beating. b. Jimmy was fired for insubordination.
Example Output:
a