Given the task definition and input, reply with output. 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'.

Sentence 1: Yesterday I went to the beach with my friend. Sentence 2: My friend told me she would be right back. Sentence 3: Unfortunately I was sitting there alone for an hour. Sentence 4: By the time she came back, I was furious. Sentence 5: I was irritated she took so long. Choices: a. Found wallet. b. Very long wait.
b