Bob the Penguin wants to find out if a given number is a square number. Will you help him?

## Task

Write a program that takes in 1 integer value, *A*, and output if the value is a square number or not.
## Constraints

0 ≤ *A* ≤ 10,000,000
## Input

Your program should read from standard input the following data:
The first line contains 1 integer *A*.
## Output

Your program should write to the standard output a string.
## Sample Input 1

9

## Sample Output 1

yes

## Sample Input 2

5

## Sample Output 2

no