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: Arthur wrote in his diary every single day. Sentence 2: One day he could not find his diary and looked everywhere. Sentence 3: Arthur even went back to school to find his diary. Sentence 4: Arthur could not sleep and he tried to remember where it was. Sentence 5: The next day, he found it in the lost and found at school. Choices: a. Shorts. b. Diary.

b