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.

Example Input: Title: Dropping Out. Sentence 1: Tom was doing poorly in college. Sentence 2: He was unable to turn things around. Sentence 3: He wound up dropping out. Sentence 4: Tom took some time off before returning. Choices: a. He did much better the second time. b. So we decided to make it a funny hat party.
Example Output: a

Example Input: Title: The Gym. Sentence 1: Sandra was nervous. Sentence 2: She just got her gym membership. Sentence 3: She walked in the door and was a bit intimidated. Sentence 4: She overcame it though and began working out. Choices: a. A decade later she became a prima ballerina. b. She felt great working out in the gym.
Example Output: b

Example Input: Title: Arizona. Sentence 1: My sister in law's grandson is 25. Sentence 2: He has not worked a steady job since graduating from high school. Sentence 3: Recently he moved from MA to Arizona to find himself. Sentence 4: A month later, he returned to Boston. Choices: a. The rumor is he has a substance abuse problem. b. Josh received an F and failed his class.
Example Output:
a

