class Worklist:
  """Describes a simple list data type."""

  def add(self, element):
    """Adds a new element into this list."""

  def remove(self):
    """Removes the next element from this list."""

  def hasMore(self):
    """Returns True if this list is not empty."""

class Node:
  """The node that must be inserted into the different lists."""
  def __init__(self):
    self.n = 0
    self.e = ''

class Stack:
  """Describes a stack data type."""

  def __init__(self):
    self.top = Node()

  def add(self, element):
    """Adds a new element into this list."""
    self.top.e = element
    aux = Node()
    aux.n = self.top
    self.top = aux

  def remove(self):
    """Removes the next element from this list."""
    self.top = self.top.n
    return self.top.e

  def hasMore(self):
    """Returns True if this list is not empty."""
    return (self.top.n != 0)

def removeAll(s):
  """Removes all the elements from the data structure."""
  while (s.hasMore()):
    print s.remove()