Given the task definition and input, reply with output. 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: Yesterday I was running with my friends. Sentence2: We decided to run in the woods. Sentence3: I ran as fast as I could. Sentence4: Yet before I knew I, I tripped over a log. Sentence5: I ended up falling flat on my face.
I (myself), Friends