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: Joe imagined getting rich by finding a priceless pearl. Sentence2: He took his boat to an oyster bed and started looking. Sentence3: He tossed the oysters aside when he found no pearls inside. Sentence4: Hours later, Joe had nothing to show for his troubles. Sentence5: His stomach grumbled and Joe thought of the wasted oysters.

Ex Output:
Joe

Ex Input:
Sentence1: Galen's father loved sailboats. Sentence2: Galen never had time to learn to sail. Sentence3: One day, he decided that he wanted to try it out. Sentence4: Galen asked his father to teach him to sail. Sentence5: He now has a new favorite hobby.

Ex Output:
Galen, Father

Ex Input:
Sentence1: Terry works seventy hours a week. Sentence2: He came home one day and was exhausted from working so hard. Sentence3: Terry looked outside and saw his lawn was very long. Sentence4: He groaned and went outside to get the lawnmower. Sentence5: As he was mowing Terry decided to move to an apartment.

Ex Output:
Terry