The impossible equation

If {x=20082008200820082008...200820082008 repeated 2018 timesy=20072007200720072007...200720072007 repeated 2018 times\begin{cases} x= \underbrace{20082008200820082008...20082008}_{\text{2008 repeated 2018 times}} \\ y=\underbrace{20072007200720072007...20072007}_{\text{2007 repeated 2018 times}} \end{cases} then find the value of 2007x2008y2007x-2008y.

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