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: New Dog. Sentence 1: The Smith family had been looking for a dog. Sentence 2: They went to the shelter every few weeks to find the perfect dog. Sentence 3: One weekend they finally found it. Sentence 4: They adopted a sweet black and white dog. Choices: a. But with no money he made it to the soup kitchen. b. They were excited to have new addition to their family.

Ex Output:
b

Ex Input:
Title: Sal loses his keys. Sentence 1: Sal wakes up late for work. Sentence 2: He rushes to get ready. Sentence 3: He has no time to eat breakfast. Sentence 4: He looks for his car keys and cannot find them. Choices: a. Luke makes it through the night without freezing. b. Sal cannot get to work because he lost his keys.

Ex Output:
b

Ex Input:
Title: Pythons taking over. Sentence 1: One day a man in Florida realized his pet python had got to big. Sentence 2: So the man released his python into the wild. Sentence 3: That python found another Python and they had a lot of baby pythons. Sentence 4: Now there are thousands of pythons in Florida. Choices: a. Farmer Ben's chickens no longer went missing. b. Alligators in Florida now fight with these Pythons.

Ex Output:
b