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: My friend Sam has been taking melatonin for sleeping. Sentence2: He said yesterday he dreamed of a pretty yellow eyed woman. Sentence3: He said the dream was vivid and sexual. Sentence4: I warned him about taking too much medication. Sentence5: He claims melatonin is harmless.
A:
I (myself), Yellow eyed woman, Sam