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: John went to his mailbox to check for mail. Sentence 2: Inside, he found the usual junk mail. Sentence 3: He also found a letter from the friend he had not seen in many years. Sentence 4: The letter explained what his friend had been up to over the years. Sentence 5: That same day, John wrote a letter in reply. Choices: a. Nice Clock. b. Letter to a Friend.

b