 Complete the following phrase:  AstakhovaRogonov started their season by taking silver medal at their first 201718 ISU Challenger Series event, the 2017 CS Ondrej Nepela Trophy They then finished 5th at the 2017 CS Finlandia Trophy. Competing on the Grand Prix series, they won two bronze medals, first at the 2017 Rostelecom Cup and then at the 2017 NHK Trophy where they scored their personal best score of 203.64 points. This was the first international event where they scored above 200 points. They then skated their 3rd CS event, the 