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: Mel and Joe needed curtains for their new apartment. Sentence2: Mel and Joe didn't have money to buy any curtains. Sentence3: Mel searched the apartment for something to hang in the window. Sentence4: All she found was her pillow case. Sentence5: Mel decided to just go without a pillow case.
Output:
Mel, Joe