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: Aeris and her best friend were trying to win tickets to a concert. Sentence 2: All they have to do is be the 10th caller on a radio show. Sentence 3: They got their phones ready. Sentence 4: It was time. Sentence 5: Aeris was the 10th Caller! Choices: a. 10th Caller. b. Stolen Bike.

a