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 System Check. Sentence 1: Marvin called a repairman to his house. Sentence 2: His air conditioner seemed to be struggling. Sentence 3: It was almost 80 degrees in his house. Sentence 4: The repairman replaced a part. Choices: a. He watched them until they were out of sight. b. By that evening, the house was a cool 72 degrees.

Ex Output:
b

Ex Input:
Title: Purse left behind. Sentence 1: Mary took her purse into the bathroom stall and set it on the shelf. Sentence 2: Without thinking, she exited the bathroom without her purse. Sentence 3: Later she realized she didn't have her purse. Sentence 4: She ran to the bathroom and found her purse. Choices: a. Unfortunately, her wallet had been emptied and she was sad. b. James passed the written part which made him happy.

Ex Output:
a

Ex Input:
Title: Hiking in the Woods. Sentence 1: My dog loves to hike. Sentence 2: She is very active and we take her to many different places. Sentence 3: We went for a hike during a heavy snow and got turned around. Sentence 4: We could not figure out which way the car was. Choices: a. I had to wear headphones. b. The dog was able to navigate and get us back to the car safely.

Ex Output:
b