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'.

Example Input: Sentence 1: I was walking outside one day. Sentence 2: I passed a watermelon stand. Sentence 3: A man was selling watermelons for 100 dollars each. Sentence 4: At first, I laughed at how expensive they were. Sentence 5: When I tasted how sweet they were, I bought five of them. Choices: a. Musical Disappointment. b. Expensive watermelon..
Example Output: b

Example Input: Sentence 1: Jo was in middle school. Sentence 2: She was used to getting good grades. Sentence 3: One day she forgot to study. Sentence 4: Her teacher gave a pop test. Sentence 5: Miley made her first bad grade. Choices: a. Thanksgiving. b. Grades.
Example Output: b

Example Input: Sentence 1: Sam thought he was a Texan. Sentence 2: He went to a bar with a mechanical bull. Sentence 3: He figured it would be fun to show off. Sentence 4: Sam got knocked off within a second. Sentence 5: He walked off and pretended it didn't happen. Choices: a. Club Night. b. Mechanical Bull.
Example Output:
b