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: Pranks. Sentence 1: One time I was in a discipleship school. Sentence 2: We liked to play pranks on each other. Sentence 3: One night a bunch of us got together and started planning. Sentence 4: We decided to put potatoes under someone's pillow. Choices: a. He managed to finish the race. b. As soon as she lay down she was surprised by the potatoes.
Example Output: a

Example Input: Title: The onion plant.. Sentence 1: Louise wanted to learn to grow onions. Sentence 2: It required many steps and Louise failed her first attempts. Sentence 3: Finally she got a successful plant growing. Sentence 4: She harvested the onions and hoped for the best. Choices: a. Luckily, they were delicious and juicy. b. She was very proud of their good hearts.
Example Output: b

Example Input: Title: math problems. Sentence 1: Stephen was learning multiplication in school. Sentence 2: His teacher showed them a special trick to solving problems. Sentence 3: Stephan did not understand what his teacher was saying. Sentence 4: He had to ask his mom to explain multiplication to him. Choices: a. Eventually he was given a job as a coach and he was happy. b. After talking to his mom Stephan still had no idea what to do.
Example Output:
a