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: 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: Pet Mouse. Sentence 1: One day AJ got a pet mouse. Sentence 2: He named it Squeaks. Sentence 3: He designed Squeaks' cage to look cool. Sentence 4: He brought Squeaks home and put him in the cage. Choices: a. He already loved his new pet. b. She was now famous!

Ex Output:
a

Ex Input:
Title: Snack. Sentence 1: Marty plucked the hot sweet potato from the ashes. Sentence 2: It was steaming, but he verified that it was soft too. Sentence 3: Tossing the potato back and forth between his hands, he went inside. Sentence 4: Once there, set the potato down and got a bowl and butter. Choices: a. Ana decided it was appropriate as long as he couldn't read the words. b. He peeled it and dropped it into the bowl with the butter.

Ex Output:
b