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: Mike is leaving work. Sentence 2: He gets on the elevator to go to ground level. Sentence 3: While on the elevator it stops. Sentence 4: Mike panics to get out. Sentence 5: Help comes soon and the elevator is fixed. Choices: a. Mike is stuck. b. Walk.
Output:
a