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.
Q: Sentence1: We replaced our old printer a month ago. Sentence2: It was printing only one page at a time. Sentence3: We kept the old printer only because it was too heavy to move. Sentence4: Today our son came over and threw the printer away. Sentence5: We were glad to get rid of it.
A:
Son