You will be given a definition of a task first, then some input of the task.
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: Sylvie wanted to get something special for her Grandma's birthday. Sentence 2: She wanted to hand knit a hat and scarf, but didn't know how to knit. Sentence 3: She bought knitting supplies and looked up knitting tutorials online. Sentence 4: She was able to knit the hat and scarf in time for the birthday. Sentence 5: Her grandmother loved them! Choices: a. Delivery. b. Knitting.
Output:
b