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: Colin and Jo were having problems in their marriage. Sentence2: Jo felt that Colin worked too much. Sentence3: On the other hand, Colin felt that Jo didn't appreciate his work. Sentence4: After seeing a marriage counsellor, Jo felt that it was too late. Sentence5: She filed for a divorce because she didn't love him anymore.
A:
Colin, Jo, Marriage counsellor