My two test cases are wrong plese reviwe my code tell me how could i improve this

#1

import java.util.;
public class Main {
public static void main(String args[]) {
Scanner sc= new Scanner(System.in); //System.in is a standard input stream
int a= sc.nextInt();
if (a<=2){
System.out.print("-1");
}
else if (a % 2 == 1){
int num = (aa-1)/2;
System.out.print(num + " ");
System.out.print(num+1);
}
else if (a % 2 == 0){
int num = (a*a-4)/4;
System.out.print(num + " ");
System.out.print(num+2);
}
}
}

#2

@er13aashishgupta_144ebaf32c98e77e Since Output can be very very large instead of using int use long variable to store the answer.

#3

I did that but again same problem\

#4

@er13aashishgupta_144ebaf32c98e77e Since input value can also be greater (10^9). Therefore your a should also be of type long, not int. Corrected Code :

import java.util.*;
public class Main {
    public static void main(String args[]) {
		Scanner sc= new Scanner(System.in);    //System.in is a standard input stream
		long a= sc.nextInt();  
		if (a<=2){
			System.out.print("-1");
		}
		else if (a % 2 == 1){
			long num = (a*a-1)/2;
			System.out.print(num + " ");
			System.out.print(num+1);
		}
		else if (a % 2 == 0){
			long num = (a*a-4)/4;
			System.out.print(num + " ");
			System.out.print(num+2);
		}
    }
}