import java.io.*;

class ahmed {
    void keep() {
        System.out.println("ps");
    }
}

class mahmoud extends ahmed {
    void keep() {
        System.out.println("jfsn");
    }
}


class hab{ 
    public static void main(String[] args) {
        ahmed ls = new ahmed();
        ls.keep();

        mahmoud mem = new mahmoud();
        mem.keep();
        System.out.println(mem instanceof mahmoud);
        System.out.println(mem instanceof ahmed);
        System.out.println(ls instanceof mahmoud);
        System.out.println(Integer.valueOf(434));
    }
}