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: Hey that isn't me. Sentence 1: Two twins were shopping. Sentence 2: One of the twins left the store stealing a coat. Sentence 3: The security man sees this and rushes to catch him. Sentence 4: The security man catches the innocent twin. Choices: a. He had tripped over his laces on the stairs, fell and broken his arm. b. The innocent twin is taken to jail for a crime he didn't commit.

Ex Output:
b

Ex Input:
Title: New home. Sentence 1: Reno was a stray dog. Sentence 2: He was in a shelter for many months. Sentence 3: He didn't think he would find a family. Sentence 4: One day a woman came to the shelter. Choices: a. She adopted Reno. b. Henry felt ashamed afterwards.

Ex Output:
a

Ex Input:
Title: Sandy Beach. Sentence 1: Brent and his friends went to the Beach and played in the sand. Sentence 2: When Brent arrived back home, he tracked sand into the house. Sentence 3: His wife screamed and cried because of the mess he made. Sentence 4: Brent cleaned up the sand and promised not to make a mess again. Choices: a. Brent learned to clean up after his own messes. b. Knocks on the door but no answer!

Ex Output:
a