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: I always hated secret santa. Sentence2: I never knew what was cool to by a complete stranger. Sentence3: In fourth grade I got a boy named Gabriel, who I had never spoken to. Sentence4: I bought him an Usher album. Sentence5: Turned out he didn't even speak English.
Output:
I (myself), Gabriel, Usher, Stranger