JAVA Help

import java.util.*;
class neon
{
    public static void main()
    {
        Scanner s=new Scanner(System.in);
        int n,sq,a,sum=0;
        n=s.nextInt();
        sq=n*n;
        while (sq>0)
        {
            a=sq%10;
            sum=sum+a;
            sq=sq/10;
        }
        if (sum==n)
        System.out.println("neon no.");
        else
        System.out.println("not neon no.");
    }
}