You will be given a definition of a task first, then some input of the task.
In this task, you're given the title of a five-sentence story, the first four sentences, and two options for the fifth sentence as a and b. Your job is to pick the sentence option that does not connect with the rest of the story, indicating your choice as 'a' or 'b'. If both sentences are plausible, pick the one that makes less sense.

Title: Ice. Sentence 1: I used to deliver fliers everyday in the hot sun. Sentence 2: My water bottle always ended up really hot. Sentence 3: When I put ice in it, the ice melted. Sentence 4: I decided to buy a special thermos that kept the cold in. Choices: a. Prize for 2nd place at the video game tournament was thousand dollars! b. Now I always had cold water when I was in the hot sun.
Output:
a