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: Grace was out for a walk in her neighborhood. Sentence2: She saw a big mound of red dirt. Sentence3: She kicked it to see what would happen. Sentence4: A swarm of fire ants poured out of the mound Sentence5: Grace turned and ran as fast as she could.
Output:
Grace