CF1225A Forgetting Things

Kolya is very absent-minded. Today his math teacher asked him to solve a simple problem with the equation $ a + 1 = b $ with positive integers $ a $ and $ b $ , but Kolya forgot the numbers $ a $ and $ b $ . He does, however, remember that the first (leftmost) digit of $ a $ was $ d_a $ , and the first (leftmost) digit of $ b $ was $ d_b $ . Can you reconstruct any equation $ a + 1 = b $ that satisfies this property? It may be possible that Kolya misremembers the digits, and there is no suitable equation, in which case report so.

The only line contains two space-separated digits $ d_a $ and $ d_b $ ( $ 1 \leq d_a, d_b \leq 9 $ ).

If there is no equation $ a + 1 = b $ with positive integers $ a $ and $ b $ such that the first digit of $ a $ is $ d_a $ , and the first digit of $ b $ is $ d_b $ , print a single number $ -1 $ . Otherwise, print any suitable $ a $ and $ b $ that both are positive and do not exceed $ 10^9 $ . It is guaranteed that if a solution exists, there also exists a solution with both numbers not exceeding $ 10^9 $ .