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: A New Dress. Sentence 1: Joanna was very excited. Sentence 2: Today was her birthday. Sentence 3: Her mother took her out to go shopping. Sentence 4: They went into a clothes store and tried on dresses. Choices: a. Joanna got a beautiful new dress and was so happy. b. Her mom said no.
Example Output: a

Example Input: Title: Happy Birthday. Sentence 1: Heathers mom's birthday is today. Sentence 2: Heather waited until the last minute. Sentence 3: She waited so long to get something she almost forgot. Sentence 4: Heather went to the store looking around. Choices: a. She would use furniture to block some of the outlets. b. She decided to get a bouquet of flowers for her mother.
Example Output: b

Example Input: Title: Heater. Sentence 1: It was a very hot and humid day. Sentence 2: Anna couldn't wait to go swimming in her pool after work. Sentence 3: But when she stepped in, she sighed with disappointment. Sentence 4: She had left the pool heater on all day accidentally. Choices: a. Anna was impressed by the aquatic beauty! b. The pool felt like a hot tub - not at all refreshing!
Example Output:
b