import java.util.*;

public class Ex07removeDuplicates {

	public static void removeDuplicates(List<String> list) {
		for (int i=list.size()-1; i>=0; i--) {
			if (i-1 >= 0) {
				String s1 = list.get(i-1);
				String s2 = list.get(i);
				if (s1.equalsIgnoreCase(s2)) {
					list.remove(i);
				}
			}
		}
	}

	public static void main(String[] args) {
		String[] strs = {
				"Z","Y","X","W","V","Z","Y","X","W","V","Z","Y","X","W","V"};
		List<String> list =
				new ArrayList<String>( Arrays.asList(strs) );
		Collections.sort(list);
		System.out.println(list);
		removeDuplicates(list);
		System.out.println(list);
	}

}