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: Conrad rented a hot air balloon for the afternoon. Sentence2: The winds carried him further than he expected. Sentence3: The balloon landed in a cow pasture 25 miles away. Sentence4: Conrad petted the cows as he figured out how to get home. Sentence5: For the moment he was content just being with the cows.
Cows, Conrad