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: Geometry Test. Sentence 1: Kyle has a geometry test in the morning. Sentence 2: He thought he knew all the formulas. Sentence 3: When he got to the test, his mind went blank. Sentence 4: He was not able to answer any questions. Choices: a. He had to turn his paper in blank. b. He didn't answer it.

Ex Output:
a

Ex Input:
Title: The Halloween Party. Sentence 1: Susan was invited to a Halloween party. Sentence 2: She planned her costume for weeks. Sentence 3: The day of the party, Susan donned her costume. Sentence 4: Everyone loved Susan's costume. Choices: a. Susan won first place in the costume contest. b. From then on Tom didn't stuff himself as much.

Ex Output:
a

Ex Input:
Title: The Piggy Bank. Sentence 1: The kids put their change into their piggy bank every day. Sentence 2: Soon, the bank was full. Sentence 3: They smashed it open and counted the money. Sentence 4: They had almost $100! Choices: a. They took the money and spent it at the arcade. b. She was very happy as the Red Sox won.

Ex Output:
a