Detailed 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.
Problem:Sentence1: I invited my friend over to join my team as a substitute. Sentence2: He agreed and I went to the coach to ask if he could join. Sentence3: He said if it's fine for the referee, it's fine to him. Sentence4: After asking the referee, he said it was within limits. Sentence5: He obliterated the competition and we managed to win by 4 goals!
Solution:
I (myself), Referee, Coach, Friend