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: Toad. Sentence 1: Anna found a big toad in the road outside her house. Sentence 2: She carried it inside and asked her mom to keep it. Sentence 3: But her mom explained that the toad would be happier outside. Sentence 4: Anna thought it over and decided her mom was right. Choices: a. She went back outside and let the toad hop away, free. b. She happily chatted for an hour.
Example Output: a

Example 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.
Example Output: a

Example Input: Title: Hailey goes on vacation.. Sentence 1: Hailey is looking forward to her vacation and she has a lot to do to. Sentence 2: She started doing her laundry to make sure her clothes were clean. Sentence 3: When the clothes were done, she started to pack her suitcase. Sentence 4: After everything was packed she went to bed early enough to get sleep. Choices: a. She walk up early the next day and it was time for her to travel. b. She decided she would go back to wood floors when she could afford it.
Example Output:
a