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: Rats. Sentence 1: There were a lot of rats in my house. Sentence 2: I went to the store to buy traps to get rid of them. Sentence 3: I bought a lot of traps that day, but I didn't buy enough. Sentence 4: I used all the traps but there are still a lot of rats in my house. Choices: a. Gordon will never learn. b. I'll have to buy some more tomorrow.

Ex Output:
b

Ex Input:
Title: Moving Day. Sentence 1: It was the end of an era. Sentence 2: John and Jim were moving out of their old place. Sentence 3: They had lived their all throughout college. Sentence 4: The move was bittersweet. Choices: a. The new house was going to be great. b. Stan was happy that he had found love.

Ex Output:
a

Ex Input:
Title: Piano. Sentence 1: Mary wanted to play the piano. Sentence 2: Her mom played her some private lessons. Sentence 3: Mary came for her first lesson. Sentence 4: She wanted to play her favorite song. Choices: a. Finally she was able to get the bath drawn and the kids clean. b. The teacher told her she is not ready for this difficult piece yet.

Ex Output:
b