Problem Description

Given a number A. Return square root of the number if it is perfect square otherwise return -1.

Problem Constraints

1 <= A <= 10^8

Input Format

First and the only argument is an integer A.

Output Format

Return an integer which is the square root of A if A is perfect square otherwise return -1.

Example Input

Input 1: A = 4
Input 2: A = 1001

Example Output

Output 1: 2
Output 2: -1

Example Explanation

Explanation 1: sqrt(4) = 2
Explanation 2: 1001 is not a perfect square.