Given the task definition and input, reply with output. 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.

Sentence1: Carlos always loved being near the water. Sentence2: His friend invited him to go sailing one day. Sentence3: Carlos and his friend spent the entire day sailing. Sentence4: It was a great day. Sentence5: Carlos was happy that he had spent the day on the water.
Friend, Carlos