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: Fans of Clark. Sentence 1: A heat wave swept the city one summer. Sentence 2: Clark was concerned about his elderly neighbors. Sentence 3: They did not have air conditioning. Sentence 4: Clark bought several large fans for his neighbors. Choices: a. They were thankful to have some relief from the heat. b. She knit blue into the yarn blanket.

Ex Output:
a

Ex Input:
Title: Leaking ceiling. Sentence 1: Susy had a very large house. Sentence 2: Last week it snowed very badly. Sentence 3: She thought she got rid of all of the snow. Sentence 4: But unfortunately the roof leaked. Choices: a. So Susy had to call someone. b. They still preferred their own favorites, but their minds were opened!

Ex Output:
a

Ex Input:
Title: Broken Glasses. Sentence 1: Sam's glasses broke while he was playing football. Sentence 2: They snapped in half right in the middle. Sentence 3: Sam had to use tape to hold them together. Sentence 4: He was embarrassed - until his brother said he resembled Harry Potter! Choices: a. Then Sam was proud of his cool, stylish glasses! b. Now it only takes me half the time to get home.

Ex Output:
a