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: My sister-in-law called me yesterday. Sentence 2: She wanted to change the wallpaper on her phone. Sentence 3: I could not tell her how to do it, as she had an old slide phone. Sentence 4: I had to go to youtube to get lessons. Sentence 5: I called her today but her daughter had fixed the problem. Choices: a. Wallpaper. b. Mike's Story.

a