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: Last night I saw a pretty girl in the library. Sentence 2: I decided I should go up to her and ask for her phone number. Sentence 3: I was really nervous. Sentence 4: When I asked her, she smiled and gave me her phone number. Sentence 5: I can't wait to call her tomorrow. Choices: a. Learning to walk. b. Asking a girl for her number.

b