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.

Ex Input:
Title: Mint. Sentence 1: Katherine loved to chew on mints. Sentence 2: She loved having a fresh breath. Sentence 3: One day, Katherine ran out of mints. Sentence 4: She had to quickly run to the store and buy more. Choices: a. Then, Katherine was able to keep her breath fresh for the day. b. Finally, he rushed to the store and bought more eggs.

Ex Output:
a

Ex Input:
Title: Kindergarten Graduation. Sentence 1: The students lined up in their graduation caps. Sentence 2: They entered the gym as Pomp and Circumstance played. Sentence 3: They assembled in a line beside the stage. Sentence 4: The principal called out the students' names. Choices: a. Each child received their diploma and shook the principal's hand. b. So he created a password to only let his friends in.

Ex Output:
a

Ex Input:
Title: New Phone. Sentence 1: Kayla could not wait to get a new phone. Sentence 2: Hers had been broken for a year. Sentence 3: She had been saving up for the newest technology. Sentence 4: When she got her phone, she was so excited. Choices: a. When it was ready, it tasted delicious. b. However, just as she walked outside, she broke it.

Ex Output:
b