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: Ronald wants to think of something to do with his friends. Sentence2: He decides that he would like to go bowling with them. Sentence3: They go to the local bowling alley in the afternoon. Sentence4: Ronald bowls very well. Sentence5: He is happy that he found something to do with his friends.

Ex Output:
Ronald, His friends

Ex Input:
Sentence1: I got up early the day we were leaving for vacation. Sentence2: I packed bags for each of my kids. Sentence3: I even packed a bag of stuff for the dog. Sentence4: I loaded the car and we got an early start. Sentence5: Thirty miles down the road I realized I hadn't packed a bag for me.

Ex Output:
I (myself), Dog, My kids

Ex Input:
Sentence1: Marty and his son, John, went into the convenience store. Sentence2: Marty gave the cashier twenty dollars to fill up his tank. Sentence3: Outside Marty pumped his gas while John washed the windows. Sentence4: They hit the road heading to John's grandpa's. Sentence5: John snacked on his stolen candy bar in the back.

Ex Output:
Marty, John's grandpa, John