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: Cleaning Day. Sentence 1: Charles hated cleaning the house. Sentence 2: This week he had extra chores. Sentence 3: He decided to wake up early and get it over with. Sentence 4: Charles worked into the early afternoon. Choices: a. He vowed to never make the same mistake again. b. He was able to finish everything and relax after.
Example Output: b

Example Input: Title: Flight of the Bumblebee. Sentence 1: Dottie waved her net through the air. Sentence 2: She was catching butterflies in the summer sun. Sentence 3: There was an especially fat one with yellow and black stripes. Sentence 4: With a swish of her net, Dottie snared the butterfly. Choices: a. No long after the trip the wall was taken down. b. Further examination revealed the butterfly was actually a bumblebee.
Example Output: b

Example Input: Title: John's Success. Sentence 1: John was a very bad student. Sentence 2: He never turned in his homework. Sentence 3: His teachers thought he'd be in prison by age 20. Sentence 4: John sought to prove them wrong. Choices: a. By age 22, he was the CEO was a multi-million dollar company. b. Bob was so heated he wrote a stern letter of complaint to the airline.
Example Output:
a