import java.util.*;

public class Task121225 {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>(Arrays.asList("A", "B", "C", "D"));
        ListIterator<String> it = list.listIterator();
        
        System.out.print(it.next() + " ");
        System.out.print(it.next() + " ");
        
        it.add("X");
        
        System.out.print(it.previous() + " ");
        System.out.print(it.next() + " ");
        System.out.print(it.previous() + " ");
        
        it.remove();
        
        System.out.println(list);
    }
}