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 am a very great runner. Sentence 2: So, I decided to enter a 5K to challenge myself. Sentence 3: I trained every single day until the day of the race. Sentence 4: Although I trained every day, I didn't do as well as I hoped I would. Sentence 5: However, it was still a challenge and something I would try again. Choices: a. 5K. b. Lost Money.

a