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: Sam took his pet bird out for a walk. Sentence 2: She couldn't fly, but when the wind gusted, she was lifted in the air. Sentence 3: The bird was swept up into the top of a tall tree. Sentence 4: Devastated, Sam waited at the foot of the tree all day. Sentence 5: As dusk fell, the bird grew scared and fluttered down to Sam's feet. Choices: a. lost ring. b. Happy ending.

b