You will be given a definition of a task first, then some input of the task.
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'.

Sentence 1: My boss called me to the office. Sentence 2: He asked if I can work during the night shift. Sentence 3: Since I really needed the money, I said yes. Sentence 4: The shift lasted a total of 6 hours. Sentence 5: As soon as I got home, I fell on the couch and went to sleep. Choices: a. Night Shift. b. Ziplining.
Output:
a