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: Ella had left her car unlocked. Sentence 2: She had left her purse in the car. Sentence 3: Her purse was missing when she returned to the car. Sentence 4: Ella realized someone had stolen her purse. Sentence 5: Ella always locked her car after this. Choices: a. Doctor. b. The Unlocked Door.

Ex Output:
b

Ex Input:
Sentence 1: The man turned up the air conditioning. Sentence 2: He fell asleep. Sentence 3: He woke up when his wife came home. Sentence 4: It was way too cold in the house. Sentence 5: The woman got angry at the man for wasting energy. Choices: a. Stuff To Pack. b. Air Conditioning.

Ex Output:
b

Ex Input:
Sentence 1: Chris was in a black market in Mongolia. Sentence 2: He saw a sweater that looked very warm and fashionable. Sentence 3: He tried to barter with the shopkeeper. Sentence 4: The shopkeeper said 30 dollars and wouldn't go any lower. Sentence 5: Chris realized he was not any good at bartering. Choices: a. Barter. b. Hard day.

Ex Output:
a