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: John really wanted to learn the Russian language. Sentence 2: John bought materials and began studying. Sentence 3: John watched Russian movies without subtitles. Sentence 4: John spent a month living in Russia. Sentence 5: Now John is fluent in the Russian language. Choices: a. Lost in the Store. b. Fluent.
Output:
b