text: 
  def caller():
          a = []
          for i in range(33, 49):
              a.append(chr(i))
          b = []
          c = []
          d = []
          for i in range(65, 91):
              b.append(chr(i))
          for i in range(97, 123):
              c.append(chr(i))
          for i in range(48, 58):
              d.append(chr(i))
          return a, b, c, d
  
  
  
  