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.

Input: Consider 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.

Output: Galen, Father

Input: Consider Input: Sentence1: Erin was cleaning out his basement one morning. Sentence2: While he was cleaning it, he found an old antique watch. Sentence3: He searched on the internet to see what type of watch it was. Sentence4: He realized that it was a watch from the 1800s! Sentence5: He decided to put it on Ebay and he made a lot of money.

Output: Erin

Input: Consider Input: Sentence1: Anna needed new sneakers for her track team. Sentence2: But her mom could not afford them for her. Sentence3: She said Anna would have to buy them out of her own allowance! Sentence4: Anna determinedly saved her allowance every week. Sentence5: Soon she had enough for the sneakers she wanted!
Output: Anna, Her mom