Help me in solving LBJ201B problem

help
,
1

My issue

My code

// Update the '_' in the code below with the expected output
import java.util.Scanner;

class Codechef
{
	public static void main (String[] args)
	{
    	System.out.println("For A = 3 and C = 4, the output is " + (-1));
    	System.out.println("For A = 3 and C = 5, the output is " + _);
    	System.out.println("For A = 2 and C = 4, the output is " + _);
    	System.out.println("For A = 2 and C = 5, the output is " + _);
	}
}

Learning course: Java for problem solving - 1
Problem Link: CodeChef: Practical coding for everyone