Definition: 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'.
Input: Sentence 1: Every night Ella heard the train whistle, high and lonesome. Sentence 2: One day she decided to see where it went. Sentence 3: She rode her bike for miles along the tracks alone. Sentence 4: When she ended up downtown, she turned to head back. Sentence 5: She hadn't known how far she was from home! Choices: a. Train. b. Asking.
Output:
a