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: Gary was walking with a group of friends in the field trip. Sentence2: They traveled a lot throughout the forest. Sentence3: Gary decided to go to the bathroom. Sentence4: However, everyone left while he was staying in the bathroom. Sentence5: He was more disappointed than mad.
Output:
Group of friends, Gary