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: Grocery Store. Sentence 1: I woke up this morning and noticed I had no groceries. Sentence 2: Trying to change this, I got dressed real quick and got in my car. Sentence 3: I drove straight to my local grocery store and grabbed a cart. Sentence 4: After 30 minutes, I got everything I needed and out I went. Choices: a. The dog's owner thanked Rob, and came and retrieved his dog. b. Driving back to my house, I couldn't wait to cook up breakfast!

Ex Output:
b

Ex Input:
Title: Terry the Typist. Sentence 1: Terry is a professional typist. Sentence 2: Today, he was in for a long day. Sentence 3: He had to type a whole 500 page book in three hours. Sentence 4: Terry typed away and was getting blisters on his fingers. Choices: a. She hadn't known how far she was from home! b. He finished typing the book with a few minutes to spare.

Ex Output:
b

Ex Input:
Title: Running. Sentence 1: Rick decided that he wanted to start running. Sentence 2: He started off by walking every other day. Sentence 3: Before he got serious he order new running shoes. Sentence 4: Soon he started using a heart rate monitor to improve his training. Choices: a. After that, Amy was able to eat with syrup. b. Within a couple of months Rick ran a race with a bunch of friends.

Ex Output:
b