import java.util.Collections;
import java.util.Enumeration;
import java.util.Vector;
public class Main {
public static void main(String[] args) {
Vector v = new Vector();
v.add("A");
v.add("B");
v.add("D");
v.add("E");
v.add("F");
Enumeration e = Collections.enumeration(v);
while (e.hasMoreElements())
System.out.println(e.nextElement());
}
}