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'.

Ex 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..

Ex Output:
b

Ex Input:
Sentence 1: Watson had always wanted to learn the saxophone. Sentence 2: After talking to his parents, they bought him one. Sentence 3: At first, he could not play anything. Sentence 4: After a lot of hard work, he could play it. Sentence 5: Now, Watson is very good at the saxophone. Choices: a. Saxophone. b. Parents.

Ex Output:
a

Ex Input:
Sentence 1: Lisa turned thirty-five last weekend. Sentence 2: Her friends threw her surprise birthday party. Sentence 3: Everyone that was close to Lisa attended. Sentence 4: The party became a little too loud and police were called. Sentence 5: Lisa will never forget this birthday party. Choices: a. Lisa. b. Fireworks 2.

Ex Output:
a