CHGG earnings call for the period ending December 31, 2018.: Greetings, and welcome to the Chegg's Fourth Quarter 2018 Earnings Conference Call. At this time all participants are in a listen-only mode. A question-and-answer session will follow the formal presentation. (Operator Instructions) As a reminder, this conference is being recorded. I would now like to turn the conference over to your your host, Tracey Ford, Vice President of Investor Relations for Chegg. Good afternoon. Thank you for joining Chegg's Fouth Quarter and Full Year 2018 Conference Call.