import java.util.*;

class SetTest {
  public static void main(String[] args) {
    Set s;
    s = new HashSet();
    for (int i = 0; i < args.length; i++)
      if (!s.add(args[i]))
	System.out.println("Déjà vu : " +  args[i]);
    System.out.println(s.size() + " distincts : " + s);
    s = new LinkedHashSet();
    for (int i = 0; i < args.length; i++)
      if (!s.add(args[i]))
	System.out.println("Déjà vu : " +  args[i]);
    System.out.println(s.size() + " distincts : " + s);
  }
}