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: Beth owned a nice home. Sentence 2: The only problem was the roof shingles needed replacement. Sentence 3: She could not afford it to be done professionally. Sentence 4: She asked her son to do it. Sentence 5: He replaced her shingles for her, and she was grateful. Choices: a. Shingles. b. A trashed house.
Output:
a