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: When Morton was younger, he used to like climbing trees. Sentence 2: He grew out of it some time around high school. Sentence 3: Now Morton worked in a flat office building with no variety. Sentence 4: One Saturday he went to a park and climbed a tree. Sentence 5: He was judged by the other patrons but did not mind. Choices: a. Tree Climbing. b. baby sit.

a