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: Sheila was a big fan of the actor Liam Neeson. Sentence2: She checked his fan website on the internet regularly. Sentence3: One day, she learned he'd be signing copies of a book he'd written. Sentence4: She went to the local bookstore on they day Liam would be there. Sentence5: Sheila was thrilled to be able to meet him and get a book signed.
Sheila, Liam neeson