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.

Example Input: Sentence1: Every Saturday night my friends go bowling. Sentence2: Last week they invited me. Sentence3: I was so excited to go bowling with them. Sentence4: When we went bowling I did not do very well. Sentence5: Even though I didn't bowl well I had a lot of fun with my friends.
Example Output: I (myself), Friends

Example Input: Sentence1: I never sit in a chair normally. Sentence2: I sat down a minute ago and pulled my feet up. Sentence3: I balanced one foot underneath me. Sentence4: Then I put my knee up by my chest. Sentence5: I sat there resembling a monkey while I worked.
Example Output: I (myself)

Example Input: Sentence1: Jessica went to the playground on day. Sentence2: She saw a cat walking around and ran behind it. Sentence3: The cat was not friendly and attacked Jessica. Sentence4: Jessica got scratches on her arm. Sentence5: She then decided to avoid all cats from then on.
Example Output:
Jessica, Cat