class One {
public static void go() {
System.out.print("one ");
}
}

class Two extends One {
public static void go() {
System.out.print("two ");
}
}

class Three extends Two {
public static void go() {
System.out.print("three ");
}
}

public class Test {
public static void main(String[] args) {
One one = new One();
one.go();

One two = new Two();
two.go();

Two two2 = new Three();
two2.go();
}
}