text: import os
  import sys
  
  from StrongHold import MONOISOTOPIC_MASS_TABLE
  
  def main(*args, **kwargs):
      fpath = os.path.join(os.getcwd(),args[-1])
      prefix_spectrum = []
      with open(fpath,'r') as f:
          for line in f:
              prefix_spectrum.append(eval(line.strip()))
  
      inverted_table = {}
      for k,v in MONOISOTOPIC_MASS_TABLE.iteritems():
          inverted_table[round(v, 4)] = k
  
      result = ''
      for i in xrange(1, len(prefix_spectrum)):
          a = prefix_spectrum[i-1]
          b = prefix_spectrum[i]
          result += inverted_table[round(b-a, 4)]
      return result
  
  
  if __name__ == "__main__":
  
      res = main(*sys.argv)
      print res