Task: Question Answering
Input (English): Passage: TEN-10 produces a 60-minute local news program on weeknights from its studios at Pyrmont. Ten Eyewitness News Sydney is presented by Sandra Sully with sport presenter Matt Burke, weather presenter Tim Bailey and traffic reporter Vic Lorusso. The 5pm bulletin was presented for almost eleven years by Ron Wilson and Jessica Rowe, between 1996 and 2005, when Rowe moved to present the Nine Network's Today. She was replaced by the network's US correspondent Deborah Knight from 2006. Wilson anchored the nightly Sydney news until January 2009 when he became a presenter of the national Early News and was replaced by Bill Woods. Knight was replaced by Sully in October 2011 following the axing of the network's long-running late night news program, as a result with Knight's decision to move to the Nine Network. Sully became sole anchor after Bill Woods' departure on 30 November 2012, following the network's decision not to renew his contract. Fill-in presenters include Natarsha Belling , Scott Mackinnon  and Amanda Duval or Amanda Hart . 
Question: How many fill-in presenters were there? 
Answer type: Number 
Output (English): 4.