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: Sisterly Love. Sentence 1: Sheila was diagnosed with breast cancer six months ago. Sentence 2: After learning that she couldn't have surgery she started chemo. Sentence 3: Her sister Sharon takes her to all her appointments. Sentence 4: Last week Sheila learned the cancer had moved to her lungs. Choices: a. They thought this idea was just crazy! b. Sheila and Sharon both cried for a long time.

Ex Output:
b

Ex Input:
Title: Skating away. Sentence 1: Lucy wanted to skate. Sentence 2: She hadn't done it before. Sentence 3: She decided to take lessons. Sentence 4: On her first lesson she fell. Choices: a. It would be away until she got good. b. Andrew is very happy that he decided to join the cross-country team.

Ex Output:
a

Ex Input:
Title: Lost Dog. Sentence 1: Tom was dogsitting for a friend. Sentence 2: He accidentally let it out. Sentence 3: The dog ran away. Sentence 4: It was never seen again. Choices: a. Tom had to buy them a new dog. b. It was the best she had ever had.

Ex Output:
a