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: Balloons. Sentence 1: Carl was an old man who sold balloons. Sentence 2: One day, he met a young boy named Russell. Sentence 3: Russell wanted a balloon but couldn't afford one. Sentence 4: Carl was in a charitable mood. Choices: a. Bill then realized it was Saturday. b. He gave Russell two balloons for free.

Ex Output:
b

Ex Input:
Title: Not Tired. Sentence 1: Mike was three miles away from finishing a marathon. Sentence 2: But it felt like he was going to collapse. Sentence 3: So he decided to repeat to himself that he wasn't tired. Sentence 4: And Mike proudly finished the marathon. Choices: a. He also learned that he was able to control his body with his mind. b. After a few hours with her nephew, the parrot spoke new words.

Ex Output:
a

Ex Input:
Title: Love. Sentence 1: Kelly was 15 and pregnant, and couldn't raise a baby. Sentence 2: She didn't want to abort it, but she knew she couldn't keep it. Sentence 3: She decided her best choice was adoption. Sentence 4: It was hard, but she found a very loving couple. Choices: a. I told her I was disappointed in her elitist attitude. b. Kelly was proud of herself for doing what was best for her baby.

Ex Output:
b