# MCS 260 L-21 Mon 1 Mar 2010 : i/o of stack
#
# definition of a module to print a stack
# of integer numbers

from stack_data import the_stack

def input(L):
   "places elements of L on stack"
   for item in L:
      the_stack.insert(0,item)

def show_all():
   "shows all elements in the stack"
   print the_stack
   
def show_top():
   "shows the top element of the stack"
   if len(the_stack) > 0:
      print the_stack[0]
   else:
      print 'the stack is empty'