public class Wangwang extends Dog {
    int age = 50;
    public void say() {
        System.out.print("I'm the children");
    }
    public static void main(String[] args) {
        Dog a =new Wangwang();
                a.say();
    }
}

class Dog  {
    public void say() {
        System.out.println(" I'm the father!");
    }
}