import java.util.Stack;

public class DemoStack3 {
    public static void main(String[] args) {
        System.out.println("Demo de Stack");

        Stack<Character> miPila = new Stack<Character>();

        miPila.push('a');
        miPila.push('b');
        miPila.push('c');

        System.out.println(miPila.pop());
        System.out.println(miPila.pop());
        System.out.println(miPila.pop());

        try {
            System.out.println(miPila.peek());
        } catch (Exception e){
            System.out.println(e.getMessage());
        }
    }

}