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: Tree Surprise. Sentence 1: One day, my brother and I went for a walk in the woods. Sentence 2: We heard a mewing sound behind one of the trees. Sentence 3: We investigated and found a kitten there. Sentence 4: The kitten was starving so we took it home to feed it. Choices: a. We decided to keep the kitten as a pet. b. It had been a great adventure.
Example Output: b

Example Input: Title: Ryan Writes A Letter. Sentence 1: Ryan decides he would like to contact an old friend. Sentence 2: He writes his friend a long letter. Sentence 3: He sends his friend the letter in the mail. Sentence 4: His friend receives it later that week. Choices: a. Ryan is happy he contacted his friend. b. Carlos was happy that he had spent the day on the water.
Example Output: b

Example Input: Title: The Dress. Sentence 1: Molly entered the store looking for the perfect dress. Sentence 2: She searched rack after rack but found nothing. Sentence 3: A sign in the back caught her eye and she went toward it. Sentence 4: Searching through these dresses, one stood out to her. Choices: a. A blue dress fit her just right and Molly got the dress she needed. b. She ended up rudely snubbing me all day.
Example Output:
b