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: Bertie moved to the midwest. Sentence 2: He found the summers pleasantly temperate and sunny. Sentence 3: He found the winters brutally cold and unpleasant. Sentence 4: He invested in a space heater for his room. Sentence 5: It was insufficient and he had to sleep in many layers. Choices: a. Space Heater. b. Ant Attack.

a