©TCP-tryJAVA

class Parent {
	int a;
	
	Parent() { a = 10; }
	Parent(int n) { a = n; }
}

class Child extends Parent {
	int b;
	
	Child() {
		//super(40);
		b = 20;
	}
	
	void display() {
		System.out.println(a);
		System.out.println(b);
	}
}

public class prog {
	public static void main(String[] args) {
		Child ch = new Child();
		ch.display();
	}
}