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: Jill was lost in the wilderness. Sentence2: She had been hiking by herself and got separated from the trail. Sentence3: Her boyfriend called the police after not hearing from her. Sentence4: A search team was dispatched to the GPS coordinates on her phone. Sentence5: A helicopter found and rescued Jill near a large tree.
[A]: Jill, Police, Boyfriend

[Q]: Sentence1: Cathy recently took a trip to the Bahamas. Sentence2: While in the Bahamas, Cathy decided to swim with dolphins. Sentence3: Cathy was scared that the dolphins would attack her. Sentence4: However, Cathy was surprised at how docile the dolphins were. Sentence5: Cathy was so glad she took the chance to swim with the dolphins.
[A]: Cathy, Dolphins

[Q]: Sentence1: Ken had to wear a suit to his college graduation. Sentence2: But without parents, he had a tough time tying his tie! Sentence3: Finally he gave up and bought a clip-on. Sentence4: Ken was worried someone would notice it. Sentence5: But actually, he got many compliments on how nice he looked!
[A]:
Ken, Someone, Parents