import java.util.*;

public class StackDemo{
	public static void main(String[] args) {
		Stack stack=new Stack();
		stack.push(new Integer(10));
		stack.push("a");
		System.out.println("The contents of Stack is" + stack);
		System.out.println("The size of an Stack is" + stack.size());
		System.out.println("The number poped out is" + stack.pop());
		System.out.println("The number poped out is " + stack.pop());
		//System.out.println("The number poped out is" + stack.pop());
		System.out.println("The contents of stack is" + stack);
		System.out.println("The size of an stack is" + stack.size());
	}
}