public class Main {

    public static abstract class Bird {
        private void fly() { System.out.println("Bird is flying"); }
    }

    public static class Pelican extends Bird {
        public void fly() {
            System.out.println("Pelican is flying");
        }
    }

    public static void main(String[] args) {
        Bird bird = new Pelican();
        bird.fly();
    }
}