public abstract class main2 {
    public static void main(String [] args) {
        IntStackA s=new IntStack();
        IntStackA t=new IntStack();
        s.push(3);  System.out.println("s="+s);
        s.push(4);  System.out.println("s="+s);
        s.push(9);  System.out.println("s="+s);
        t.push(3);  System.out.println("t="+t);
        t.push(4);  System.out.println("t="+t);
        t.push(9);  System.out.println("t="+t);
        System.out.println("s==t: "+(s==t));
        System.out.println("equals(s,t): "+s.equals(t));
        System.out.println("hashCode(s)="+Integer.toHexString(s.hashCode()));
        System.out.println("hashCode(t)="+Integer.toHexString(t.hashCode()));
    }
}