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: Paint Time. Sentence 1: Sally wanted to paint her walls. Sentence 2: Her husband didn't want to. Sentence 3: She kept asking him. Sentence 4: He finally decided to do it. Choices: a. Just as his friends left Ron ended up catching a 20 pound flounder. b. The walls got painted.

Ex Output:
b

Ex Input:
Title: Camping Trip. Sentence 1: Alex had never been on a camping trip. Sentence 2: He was very nervous about leaving home and camping with strangers. Sentence 3: His parents assured him everything would be fine. Sentence 4: On the first day camping he mistook a baby owl for bat. Choices: a. The sound had been to low to wake him up. b. He later laughed about with his parents and friends.

Ex Output:
b

Ex Input:
Title: Trip Overseas. Sentence 1: Terry arrived to Korea. Sentence 2: He took a walk to the nearest restaurant. Sentence 3: Although many people knew English, they spoke Korean. Sentence 4: He felt isolated and lonely. Choices: a. Although he's supposed to be there for 5 days, he left in one day. b. She went downstairs to find rats had nested in the dryer hose.

Ex Output:
a