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: Jones had a very big calculator. Sentence 2: One day, he could not find his calculator. Sentence 3: He searched everywhere but it was simply missing. Sentence 4: Then, he realized he left it at school. Sentence 5: Jones rushed to school and finally found his calculator. Choices: a. Calculator. b. Captain.

a