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: I decided to run instead of walk for once. Sentence 2: It felt difficult at first. Sentence 3: But once I started, it was hard to stop. Sentence 4: I ended up running to miles my college. Sentence 5: And afterwards, I felt really good. Choices: a. Long Distance. b. Puppy.

a