In this task, you're given five sentences, numbered 1 through 5, and two options a and b for possible titles for the story. Your job is to choose the title that better fits the story. Indicate your choice by 'a' or 'b'.

Ex Input:
Sentence 1: My dog has gained some extra weight. Sentence 2: I've been trying to take him for a walk every day. Sentence 3: He's too small to walk for long. Sentence 4: I end up having to carry him home. Sentence 5: At least I'll lose some weight. Choices: a. Heart Beat. b. A walk.

Ex Output:
b

Ex Input:
Sentence 1: The man sharpened the saw blade. Sentence 2: His hand slipped. Sentence 3: He cut his arm on the saw blade. Sentence 4: He cleaned up the blood. Sentence 5: He finished sharpening the saw blade. Choices: a. Saw. b. The cookout.

Ex Output:
a

Ex Input:
Sentence 1: Tod applied to be on a game show because he's very smart. Sentence 2: Tod was approved and flown to tape the game show. Sentence 3: Tod was very nervous. Sentence 4: He even shook when he introduced himself. Sentence 5: Tod wound up winning thousands of dollars. Choices: a. Nightmares Be Gone. b. Game Show.

Ex Output:
b