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: 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: Leaky Pen. Sentence 1: John was walking around with a big stain on his pants. Sentence 2: He didn't notice until someone pointed it out. Sentence 3: John realized his pen had leaked in his pocket. Sentence 4: It ruined his pants. Choices: a. He had to throw them away and get another pair. b. They all wished they could go back home and watch their TV's.

Ex Output:
a

Ex Input:
Title: The Cougar. Sentence 1: Jake went on a hike today. Sentence 2: He was walking around his usual trail. Sentence 3: Jake saw paw prints in the mud. Sentence 4: He paused as he saw a shadow behind a bush. Choices: a. Before he stepped in, he came to his senses and stopped. b. Jake stood still as he saw a mountain lion cross the trail.

Ex Output:
b