Instructions: 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: Stewart was very bad at tennis. Sentence 2: One day, he said he wanted to become good. Sentence 3: He played for three hours every day. Sentence 4: He even played tennis in the snow. Sentence 5: After many years, he became the best. Choices: a. Tennis. b. Tissue.
Output:
a