content: class Staff
  {
  	private int StaffId;
  	private String Name;
  	private String Phone;
  	private long Salary;
  	
  	public Staff(int staffId,String name,String phone,long salary)
  	{
  		StaffId = staffId;
  		Name = name;
  		Phone = phone;
  		Salary = salary;
  	}
  	public void Display()
  	{
  		System.out.print("\t"+StaffId+"\t"+Name+"\t\t"+Phone+"\t\t"+Salary);
  	}
  }
  
  class Teaching extends Staff
  {
  	private String Domain;
  	private int Publications;
  	
  	public Teaching(int staffId, String name, String phone,long salary, String domain, int publications)
  	{
  		super(staffId, name, phone, salary);
  		Domain = domain;
  		Publications = publications;
  	}
  	public void Display()
  	{
  		super.Display();
  		System.out.print("\t\t"+Domain+"\t\t"+Publications+"\t\t"+"--"+"\t"+"--");
  	}
  }
  
  class Technical extends Staff
  {
  	private String Skills;
  	public Technical(int staffId, String name, String phone,long salary, String skills)
  	{
  		super(staffId, name, phone, salary);
  		Skills = skills;
  	}
  	public void Display()
  	{
  		super.Display();
  		System.out.print("\t\t--"+"\t\t"+"--"+"\t"+Skills+"\t"+"--");
  	}
  }
  
  class Contract extends Staff
  {
  	private int Period;
  	public Contract(int staffId, String name, String phone,	long salary, int period)
  	{
  		super(staffId, name, phone, salary);
  		this.Period = period;
  	}
  	public void Display()
  	{
  		super.Display();
  		System.out.print("\t\t--"+"\t\t"+"--"+"\t\t"+"--"+"\t"+Period);
  	}
  }
  
  public class lab2a
  {
  	public static void main(String[] args)
  	{
  	Staff staff[]=new Staff[3];
  	staff[0]=new Teaching(0001,"Narendr","271173",90000,"CSE",3);
  	staff[1]=new Technical(0002,"Ara","271172",2000,"Server Admin");
  	staff[2]=new Contract(0003,"Rahul","271174",9000,3);
  	System.out.println("Staff ID\tName\t\tPhone\t\tSalary\t\tDomain\tPublication\tSkills\t\tPeriod");
  	for(int i=0;i<3;i++)
  	{
  		staff[i].Display();
  		System.out.println();
  	}
  	}
  }