old_contents: CSI = '\x1b['
  
  
  def sequence(letter, fields=1, default=[]):
      def _sequence(*values):
          output = list(values)
          if fields >= 0 and len(output) > fields:
              raise ValueError('Invalid number of fields, got %d expected %d' %
                  (len(output), fields))
  
          while len(output) < fields and len(default) > len(output):
              output.append(fields[len(default) - 1])
  
          return ''.join([
              CSI,
              ';'.join(output),
              letter,
          ])
  
      return _sequence
  
new_contents: CSI = '\x1b['
  
  
  def sequence(letter, fields=1, default=[]):
      def _sequence(*values):
          output = list(values)
          if fields >= 0 and len(output) > fields:
              raise ValueError('Invalid number of fields, got %d expected %d' %
                  (len(output), fields))
  
          while len(output) < fields and len(default) > len(output):
              output.append(fields[len(default) - 1])
  
          return ''.join([
              CSI,
              ';'.join(map(str, output)),
              letter,
          ])
  
      return _sequence
  
subject: Convert input to string