You will be given a definition of a task first, then some input of the task.
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'.

Sentence 1: When Johnny's car broke on the highway, he was stumped. Sentence 2: It was raining very hard and he was far away from a gas station. Sentence 3: He waved for someone to stop. Sentence 4: A big truck stopped and took him along. Sentence 5: When he came back it was dark, but the car got fixed and he left. Choices: a. Snow storm. b. car problems.
Output:
b