Problem Statement

You are given integers X and Y, which satisfy at least one of $X \neq 0$ and $Y \neq 0$.
Find a pair of integers (A, B) that satisfies all of the following conditions. If no such pair exists, report so.

• -$10^{18} \leq A, B \leq 10^{18}$
• The area of the triangle with vertices at points (0, 0), (X, Y), (A, B) on the xy-plane is 1.

Input

The input is given from Standard Input in the following format:
X Y

Output

If there is a pair of integers (A, B) that satisfies the conditions, print it in the following format:
A B

Otherwise, print -1.

Constraints

• -$10^{17} \leq X, Y \leq 10^{17}$
• $(X, Y) \neq (0, 0)$
• X and Y are integers.

Sample Input 1

3 5

Sample Output 1

1 1

The area of the triangle with vertices at points (0, 0), (3, 5), (1, 1) is 1. Thus, (A, B) = (1, 1) satisfies the conditions.

Sample Input 2

-2 0

Sample Output 2

0 1

Sample Input 3

8752654402832944 -6857065241301125

Sample Output 3

-1

见题面 Input 部分

见题面 Output 部分