class SampleLex:
  alpha = 'abcdefghijklmnopqrstuvwxyz'
  digit = '0123456789'
  table = [
   [1,3,0],
   [1,1,2],
   [2,2,2],
   [3,3,3],
  ]
  relations = {
    "alpha":0, 
    "digit":1,
  }


  def __init__(self, file_name='ziew'):
    self.f = open(self.file_name, 'r')
    self.chars = ''
    self.state = 0
		
  def scan(self):
    for line in self.f.readlines():
      for c in line:
	if self.state == 3:
          print "Error"
	  self.state = 0
          self.chars = ''				
        elif self.state == 2:
          print self.chars
          self.state = 0
          self.chars = ''
	print self.state
	self.state = self.table[self.state][self.lex(c)]
				
	def lex(self, c):
          self.stack.append(currChar)
	  if c in self.alpha:
            return 1
          elif c in self.digit:
	    return 2
          else:
            return 0

file_name = raw_input("Please enter file name: ")
lexer = SampleLex(file_name)
lexer.scan()