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.
Input: Sentence1: Tina had been having a rough week. Sentence2: Her cat died a few days ago. Sentence3: Then this morning she found out her mother had died. Sentence4: Tina felt beside herself. Sentence5: So she decided to take a trip to see a therapist.
Output:
Therapist, Mother, Tina, Cat