This is an incredibly newbie question, but I am new to HF so I need some help. I am familiar with R-S signal reports, e.g. 5-9. However, there is a CQ contest going on today where people are appending additional numbers, like 5-9-x-y where x and y are numbers. What do the numbers x and y represent? How to give a full report to someone calling CQ in a contest? Thank you.