class Main {
    static void main() {
        class Base b;
        class Sub1 s1;
        class Sub2 s2;
        class Sub3 s3;
        class Sub4 s4;
        
        b = new Base();
        s1 = new Sub1();
        s2 = new Sub2();
        s3 = new Sub3();
        s4 = new Sub4();
        printType(b);
        printType(s1);
        printType(s2);
        printType(s3);
        printType(s4);
        b = s4;
        printType(b);
        s1 = (class Sub1)b;
        printType(s1);
    }
    
    static void printType(class Base base) {
        if (instanceof(base, Sub4)) {
            Print("Sub4\n");
        } else if (instanceof(base, Sub3)) {
            Print("Sub3\n");
        } else if (instanceof(base, Sub2)) {
            Print("Sub2\n");
        } else if (instanceof(base, Sub1)) {
            Print("Sub1\n");
        } else if (instanceof(base, Base)) {
            Print("Base\n");
        }
    }
}

class Base {
}

class Sub1 extends Base {
}

class Sub2 extends Base {
}

class Sub3 extends Sub1 {
}

class Sub4 extends Sub3 {
}