Detailed Instructions: 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.
Problem:Sentence1: It was a hot summer day for Alex. Sentence2: He was tired of feeling hot. Sentence3: So he decided to go take a dip in the lake. Sentence4: He went over and jumped in. Sentence5: Now Alex was cold.
Solution:
Alex