// Access inherited and hidden fields (general check)

class Other {
	int a;
	int b;
	Object c;
	Other o;
}

class Main extends Other {
	int a, b;

	void main() {
		Other o;
		o = (Other) this;
		a = 1;
		b = 2;
		o.a = -1;
		o.b = -2;
		write(a);
		write(b);
		write(o.a);
		write(o.b);
		if (c != null) {
			if (o.o != null) {
				write(0);
			}
		}
	}
}