import java.util.Collections;
    import java.util.Vector;
    public class Main {
    	public static void main(String[] args) {
    		Vector v = new Vector();
    		v.add("X");
    		v.add("M");
    		v.add("D");
    		v.add("A");
    		v.add("O");
    		Collections.sort(v);
    		System.out.println(v);
    		int index = Collections.binarySearch(v, "D");
    		System.out.println("Element found at : " + index);
    	}
    }