Instructions: 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.
Input: Sentence1: Will woke up to get a glass of orange juice. Sentence2: When he opened the refrigerator, everything inside was warm. Sentence3: Will angrily emptied the refrigerator into a cooler. Sentence4: As he took out the last box of soda, he saw it blocked a vent. Sentence5: Almost instantly, the refrigerator filled with cold air.
Output:
Will