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: Allie and her friends went to Vegas. Sentence 2: They wanted to make some money. Sentence 3: Allie sat at the slot machine for an hour. Sentence 4: She ended up making a hundred dollars. Sentence 5: Allie was thrilled. Choices: a. Winning bet. b. New baby sitter.

a