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: Jimmy had a biology test. Sentence 2: He had studied very hard but found biology challenging. Sentence 3: He took the test and he thought he had failed. Sentence 4: He waited two weeks for his grade. Sentence 5: He found out he got an A on his test. Choices: a. Burnt Motor Oil. b. Biology Test.

Ex Output:
b

Ex Input:
Sentence 1: Ken was late for work. Sentence 2: He decided to speed to make it on time. Sentence 3: He was going 25 miles above the limit. Sentence 4: One block away from his job he got pulled over by police. Sentence 5: Ken ended up late and got a $250 ticket. Choices: a. Just missed it.. b. Speed hurts..

Ex Output:
b