Teacher:In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Teacher: Now, understand the problem? Solve this instance: Context: he following is a list of characters that first appeared in 1990, by order of first appearance. They were all introduced by the show's executive producer Des Monaghan. In January, Rebekah Elmaloglou began appearing as Sophie Simpson Link Information: Sophie Dean (née Simpson) is a fictional character from the Australian Channel Seven soap opera Home and Away, played by Rebekah Elmaloglou. She debuted on-screen during the episode airing on 23 January 1990 and appeared as a regular until 1993. Elmaloglou returned to filming when Sophie made subsequent guest appearances in 2002, 2003 and 2005 Question: How long was the character Sophie Simpson on Home and Away?
Student:
Answer: 15