You will be given a definition of a task first, then some input of the task.
In this task, you're given a story (which contains five sentences only). Your task is to find all the characters which are available in the given story.

Sentence1: Barbara had been baking for over 40 years. Sentence2: She loved experimenting with all kinds of cookies. Sentence3: One of her most popular cookies was the "monster" cookie. Sentence4: It was blue and had many different chips and nuts mixed in. Sentence5: Barbara entered the monster cookie into a local contest and won.
Output:
Barbara