// Write a stack class using MyList, like MyQueue, MyStack must eliminate possible accesses anywhere but the top (front), so
// methods are overridden

import java.util.*;

public class MyStack extends MyList
{
	public MyStack()
	{
		alist = new ArrayList<String>();
	}
	
	@Override 
	public void insertAtEnd(String a)
	{
		System.out.println("Illegal operation, stacks do not permit insertions at the end");
	}

	@Override	
	public void insert(int i, String a)
	{
		System.out.println("Illegal operation, stacks do not permit insertions anywhere but at the front");
	}

	@Override
	public String removeFromEnd()
	{
		System.out.println("Illegal operation, stacks do not permit removal from the end");
		return null;
	}
	
	@Override
	public String remove(int i)
	{
		System.out.println("Illegal operation, stacks do not permit removal anywhere but at the front");
		return null;
	}
	
	public void insert(String a)
	{
		super.insertAtFront(a);
	}
	
	public String remove()
	{
		return super.removeFromFront();
	}
}