Definition: 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: Sentence1: Albert had watched karate related shows on tv for years. Sentence2: One day Albert decided to take karate classes. Sentence3: Albert took his courses and practiced every day. Sentence4: Albert started getting the hang of karate. Sentence5: Albert learned the ways of karate.
Output:
Albert