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: Madison really wanted to buy a new car. Sentence2: She applied to work at different restaurants around town. Sentence3: One day a local restaurant hired her to be their new waitress! Sentence4: Molly worked very hard as a waitress and earned a lot of tips. Sentence5: A few months later she was able to use her tip money to buy a new car!

Ex Output:
Madison, Molly

Ex Input:
Sentence1: Germaine was a scientist working on a secret NASA project. Sentence2: It was meant to help design a ship that could travel to Mars. Sentence3: He was really attracted to a pretty woman who was his colleague. Sentence4: They finally got together and became very intimate. Sentence5: Months later he learned she was a Russian spy and he was fired.

Ex Output:
Colleague, Germaine

Ex Input:
Sentence1: Lou was checking out a new number blocking feature on his phone. Sentence2: Unfortunately, the number he blocked was somehow permanently blocked. Sentence3: No matter what he did, he couldn't get the number to be unblocked. Sentence4: He eventually had to call the company to remedy the situation. Sentence5: He was embarrassed, having to tell his neighbor why she couldn't call.

Ex Output:
Neighbor, Lou