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: Consider Input: Sentence 1: Ethan's friends challenged him to drink 2 liters of cola in an hour. Sentence 2: They pooled their funds and offered him twenty dollars. Sentence 3: Ethan accepted the challenge. Sentence 4: He struggled, but he managed to drink all the cola on time! Sentence 5: However, that night Ethan had a terrible stomach ache! Choices: a. Challenge. b. Slow in understanding.

Output: a

Input: Consider Input: Sentence 1: Eaton had just gotten braces on his top teeth. Sentence 2: At his first football game he went on the field to play. Sentence 3: He ran out for the pass and caught it. Sentence 4: Another player bumped his mouth. Sentence 5: His mouth guard ripped off a piece of his braces bracket. Choices: a. Selling Moms Gift. b. Braces Break.

Output: b

Input: Consider Input: Sentence 1: Rufus was having a tough time with bills. Sentence 2: His birthday was coming up and he hoped to get some gift money. Sentence 3: Unfortunately the day came and went without any cards. Sentence 4: Rufus was depressed and worried about money. Sentence 5: He ended up having to ask for his parents help. Choices: a. No Birthday Money. b. The New Baby.
Output: a