code: def stoichiometry_coefficients(compound, elements):
      
  
      stoichiometry = parse_compound(compound.strip()).count()
  
      return [stoichiometry[element] for element in elements]
docs: Determine the stoichiometry coefficients of the specified elements in
      the specified chemical compound.
  
      :param compound: Formula of a chemical compound, e.g. 'SiO2'.
      :param elements: List of elements, e.g. ['Si', 'O', 'C'].
  
      :returns: List of stoichiometry coefficients.