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 seamlessly connects with the rest of the story, indicating your choice as 'a' or 'b'. If both sentences are plausible, pick the one that makes more sense.

Example Input: Title: Lucy's First Day. Sentence 1: Lucy was excited to go to school. Sentence 2: Today was her first day of kindergarten! Sentence 3: She met her new teacher and classmates. Sentence 4: Lucy loved getting to know her new school. Choices: a. That night, she told her parents all about her day. b. Tom ran up the stairs as fast as he could.
Example Output: a

Example Input: Title: Pizza. Sentence 1: Mark was very tired. Sentence 2: He hard worked really hard and was relaxing on the couch. Sentence 3: He didn't feel like getting up so he called in for a pizza. Sentence 4: The delivery guy showed up and Mark payed. Choices: a. The girl loved the new song, and they started dating. b. The pizza was amazing.
Example Output: b

Example Input: Title: Sick in Bed. Sentence 1: Sean was tossing and turning one night. Sentence 2: His stomach was hurting even in his sleep. Sentence 3: Suddenly and without waking up, he became sick and threw up. Sentence 4: The wet mess in his bed awoke him. Choices: a. Luckily, Zach still enjoyed the melty mess. b. Groggily he cleaned it up and left to sleep on the couch.
Example Output:
b