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: We sat down to talk about our problems. Sentence2: He said he wanted to work it out. Sentence3: I told him I didn't know if we could. Sentence4: He said he would start to change. Sentence5: I told him I would try one more time.
I (myself)

Sentence1: A friend of ours told us to watch a show called Blippy. Sentence2: It is this odd show on Youtube. Sentence3: It is nothing special, just a show aimed for kids. Sentence4: It made me think I can maybe create a show. Sentence5: I should really think about doing that and making a ton of money.
I (myself), Ours, Kids, Friend

Sentence1: Ivan was a professional dog walker, and he worked often. Sentence2: His least favorite dog to walk, was a nasty dog named Spike. Sentence3: The dog often chased Ivan around the house, trying to bite him. Sentence4: Eventually Ivan realized he was still doing his job, just differently. Sentence5: The dog was getting exercised by running after Ivan every visit!
Ivan, Spike