1088A- Ehab and another construction problem “Codeforces” (rating #800)

Given an integer 𝑥, find 2 integers 𝑎 and 𝑏 such that:

- 1≤𝑎,𝑏≤𝑥
- b divides a (𝑎 is divisible by 𝑏).
- 𝑎⋅𝑏>𝑥
- 𝑎𝑏<𝑥

Input

The only line contains the integer 𝑥 (1≤𝑥≤100).

Output

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

**Examples**

*input*

`10`

*output*

`6 3`

*input*

`1`

*output*

`-1`