Ehab and another construction problem

给一个x，找出a,b，使： ``` 1≤a,b≤x a能被b整除 a⋅b>x a/b<x ``` 如果有，输出a,b；否则输出-1

Given an integer $ x $ , find 2 integers $ a $ and $ b $ such that: - $ 1 \le a,b \le x $ - $ b $ divides $ a $ ( $ a $ is divisible by $ b $ ). - $ a \cdot b>x $ . - $ \frac{a}{b}<x $ .

The only line contains the integer $ x $ $ (1 \le x \le 100) $ .

You should output two integers $ a $ and $ b $ , satisfying the given conditions, separated by a space. If no pair of integers satisfy the conditions above, print "-1" (without quotes).

10

6 3

1

-1