CF1269A Equation

Let's call a positive integer composite if it has at least one divisor other than $ 1 $ and itself. For example: - the following numbers are composite: $ 1024 $ , $ 4 $ , $ 6 $ , $ 9 $ ; - the following numbers are not composite: $ 13 $ , $ 1 $ , $ 2 $ , $ 3 $ , $ 37 $ . You are given a positive integer $ n $ . Find two composite integers $ a,b $ such that $ a-b=n $ . It can be proven that solution always exists.

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