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: 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.
Output:
I (myself), Friends