//18b. write a java code to demonstrate tree set
import java.util.*;
public class TreeSet18b
{
	public static void main(String[] args)
	{
		TreeSet<String> brands = new TreeSet<String>();
		brands.add("YSL");
		brands.add("Prada");
		brands.add("Louboutin");
		brands.add("null");
		brands.add("YSL");
		Iterator<String> itr = brands.iterator();
		while(itr.hasNext())
		{
			System.out.println(itr.next());
		}
	}
}