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: Scared. Sentence 1: Jimmy watched as his dog killed a mouse. Sentence 2: He looked around the field. Sentence 3: He saw mice scurrying everywhere. Sentence 4: He ran out of the field scared of the mice. Choices: a. It was still a close race, though. b. He climbed a tree and slept there that night.

Ex Output:
b

Ex Input:
Title: Kitty Rescue. Sentence 1: Allison heard a meow from outside of her bedroom window. Sentence 2: Outside, she finds a kitten stuck in a tree. Sentence 3: Allison calls her neighbor, Tom, to help get the cat. Sentence 4: Tom uses his dad's ladder to climb up and rescue the kitten. Choices: a. He told Ian it wasn't aliens but only foreign spies with hand radios. b. Allison decides to keep the kitten.

Ex Output:
b

Ex Input:
Title: Filling the Post. Sentence 1: My wife retired from work two weeks ago. Sentence 2: Her boss is having trouble filling her job. Sentence 3: One person was supposed to come to work on a Monday, but never showed. Sentence 4: Others have scheduled interviews but have not shown up. Choices: a. She is at her wits' end. b. Tom finally decided to get a new one because of it.

Ex Output:
a