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: Unknown Friend. Sentence 1: Tom got a friend request on Facebook. Sentence 2: He couldn't figure out who it was. Sentence 3: Tom decided to message them. Sentence 4: They talked to a bit before Tom figured it out. Choices: a. It was an advertising bot. b. However, it stained the table pink.
Example Output: b

Example Input: Title: Second Thoughts. Sentence 1: Penny was mad since her boyfriend broke up with her. Sentence 2: Her mom tried to give her advice. Sentence 3: However, Penny yelled at her and went to her room. Sentence 4: She took a nap until tonight. Choices: a. Tim bought many bananas, and was happy about it. b. After feeling bad, she apologized to her mom.
Example Output: a

Example Input: Title: help from everyone. Sentence 1: Pedro worked in a small diner. Sentence 2: When the diner had to close it was a tragedy in town. Sentence 3: Most locals had eaten there for the last twenty years. Sentence 4: To avoid its closure, they all pitched in. Choices: a. Angela had the best birthday ever. b. And thanks to everyone, Pedro kept the diner open.
Example Output:
a