import java.util.*;

class Program6
{
	public static void main(String[] argv)
	{	
		//Set<String> halmaz = new TreeSet<String>();		
		Set<String> halmaz = new HashSet<String>();
		
		halmaz.add("eper");
		halmaz.add("málna");
		halmaz.add("barack");		
		
		System.out.println(halmaz.size());
		System.out.println(halmaz.contains("eper"));
		
		Iterator it = halmaz.iterator();
		while(it.hasNext())
		{
			Object elem = it.next();
		}
	}
}