import javax.swing.*;
public class Book {
    String title;
    static int pages;
    public static void main(String[] args) {
     String xtitle = JOptionPane.showInputDialog(null, "Enter book title : ");
     String xpages = JOptionPane.showInputDialog(null, "Enter number of pages : ");
     String xgradeLVL = JOptionPane.showInputDialog(null, "Enter the grade level field : ");
     
     Book obj = new Book();
     obj.gettitle();
     obj.settitle(xtitle);
     obj.getpages();
     obj.setpages(pages);
     
     Textbook obj1 = new Textbook();
     obj1.getgradeLVL();
     obj1.setgradeLVL(obj1.gradeLVL);
     
     pages = Integer.parseInt(xpages);
     obj1.gradeLVL = Integer.parseInt(xgradeLVL);
     JOptionPane.showMessageDialog(null, "Book title : " +obj.gettitle() +"\nNumber of pages : " +obj.getpages() +"\nGrade level field : " +obj1.getgradeLVL());
    }
    void settitle(String xtitle){
     title = xtitle;
    }
    String gettitle(){
     return title;
  }
  void setpages(int pages){
     pages = pages;
    }
    int getpages(){
     return pages;
  }
}
class Textbook extends Book{
    int gradeLVL;
    void setgradeLVL(int gradeLVL){
     gradeLVL = gradeLVL;
    }
    int getgradeLVL(){
     return gradeLVL;
    }
}