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: Jena was cooking spaghetti for dinner. Sentence2: She went pick up the groceries from the store. Sentence3: The tomatoes appeared to be rotten. Sentence4: Jena picked up a jar of spaghetti sauce. Sentence5: She used pre made sauce instead of homemade.

Ex Output:
Jena

Ex Input:
Sentence1: Alfred hated how hot the beach sand was. Sentence2: He found wearing sandals in the sand equally unpleasant. Sentence3: He was determined to invent a solution. Sentence4: Alfred devised a heat-resistant lotion for his feet. Sentence5: He tried to gather capital to bring it to market but failed.

Ex Output:
Alfred

Ex Input:
Sentence1: Al was preparing for a distance throwing competition. Sentence2: Al hurt his shoulder during training. Sentence3: He was determined to compete despite his injury. Sentence4: His trainer, Jim, suggested he wait until next year to compete. Sentence5: Al ignored Jim's input, and placed last in the competition.

Ex Output:
Jim, Al