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: Tim's dog ran away one night. Sentence 2: He found the dog, Mo, missing in the morning. Sentence 3: He was devastated and spent all day looking for Mo! Sentence 4: Luckily, he caught Mo running around the local park. Sentence 5: Tim was so glad he had found Mo! Choices: a. Runaway. b. The Accident.

a