import java.util.*;

public class TreeSetExample {
    public static void main(String[] args) {
        // Creating a TreeSet
        TreeSet<Integer> numbers = new TreeSet<>();

        // Adding elements
        numbers.add(5);
        numbers.add(2);
        numbers.add(8);
        numbers.add(1);
        numbers.add(10);

        // Displaying the elements (will be sorted automatically)
        System.out.println("TreeSet elements: " + numbers);

        // Retrieving first and last elements
        System.out.println("First element: " + numbers.first());
        System.out.println("Last element: " + numbers.last());
        System.out.println("which element you want to delete ? ");
        Scanner mydata=new Scanner(System.in);
        int number=mydata.nextInt();

        // Checking if an element exists
        System.out.println("Does TreeSet contain "+number + numbers.contains(number));
        if(numbers.contains(number)) {
            // Removing an element
            numbers.remove(number);
            System.out.println("After removing : " + number + numbers);
        }
        else {
            System.out.println("Does not contains " + number);
        }
    }
}