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.

Ex Input:
Sentence1: Jason grew up riding motorcycles. Sentence2: He won his first motorcycle race at the age of 13. Sentence3: He kept racing and improving. Sentence4: Kawasaki sponsored him at the age of seventeen. Sentence5: Jason said that gave him to confidence to win the motocross.

Ex Output:
Kawasaki, Jason

Ex Input:
Sentence1: Burt left his car windows down one sunny day in New Jersey. Sentence2: The weather changed and soon it started to downpour. Sentence3: Burt ran to his car and rolled up his windows during the storm. Sentence4: The inside was not very wet yet. Sentence5: Burt sighed in relief and vowed to never be so foolish again.

Ex Output:
Burt

Ex Input:
Sentence1: I had been trying to ignore an abscess that was infecting my groin. Sentence2: After three days the bleeding wouldn't stop. Sentence3: I went to the emergency room. Sentence4: I had to be transferred in an ambulance with only a sheet on me. Sentence5: I was very grateful that the wind didn't expose me to everybody.

Ex Output:
I (myself), Emergency room