Q: 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: Donald never learned how to fish. Sentence2: His friends always said they would teach him. Sentence3: But they never invited him on trips. Sentence4: He was about to buy a fishing pole for himself. Sentence5: But then didn't when he realized how sad it was.
A:
Donald's friends, Donald