Definition: 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: Tommy grabbed a bowl from the kitchen and filled it with baking soda. Sentence2: After a minute, he found a jug of vinegar as well. Sentence3: He heard about doing this from a classmate. Sentence4: With a brief hesitation, he poured the vinegar into the bowl. Sentence5: A foamy substance began to overflow onto the counter.
Output:
A classmate, Tommy