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: Tom went to the library. Sentence 2: He saw a pretty girl reading a book at a table. Sentence 3: He sat down next to her. Sentence 4: They started a conversation. Sentence 5: The left the library together. Choices: a. Meeting. b. Letter to Ryan.

a