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: The Lost Ticket. Sentence 1: George was supposed to ride a ferry one day. Sentence 2: When he went to board he noticed his ticket was missing. Sentence 3: He searched everywhere for the ticket. Sentence 4: Before long, the ferry had left without him. Choices: a. Luckily he was able to replace his ticket and catch a later ferry. b. It was great to keep memories around the house.

Ex Output:
a

Ex Input:
Title: Pet Mouse. Sentence 1: One day AJ got a pet mouse. Sentence 2: He named it Squeaks. Sentence 3: He designed Squeaks' cage to look cool. Sentence 4: He brought Squeaks home and put him in the cage. Choices: a. He already loved his new pet. b. She was now famous!

Ex Output:
a

Ex Input:
Title: First day of school. Sentence 1: Yesterday was the first day of school. Sentence 2: I was really scared because I didn't know anyone. Sentence 3: During lunch I sat next to someone names Phillip. Sentence 4: Me and Philip became really good friends. Choices: a. They ended up walking for three miles before heading back home. b. Now I'm not scared to go to school anymore.

Ex Output:
b