(highest)
:param highest: integer of highest exam score.
    :return: list of integer lower threshold scores for each D-A letter grade interval.
             For example, where the highest score is 100, and failing is <= 40,
             The result would be [41, 56, 71, 86]:

             41 <= "D" <= 55
             56 <= "C" <= 70
             71 <= "B" <= 85
             86 <= "A" <= 100
:param highest: integer of highest exam score.
    :return: list of integer lower threshold scores for each D-A letter grade interval.
             For example, where the highest score is 100, and failing is <= 40,
             The result would be [41, 56, 71, 86]:
: param highest : integer of highest exam score . : return : list of integer lower threshold scores for each D - A letter grade interval . For example where the highest score is 100 and failing is < = 40 The result would be [ 41 56 71 86 ] :
def letter_grades(highest):
    """
    :param highest: integer of highest exam score.
    :return: list of integer lower threshold scores for each D-A letter grade interval.
             For example, where the highest score is 100, and failing is <= 40,
             The result would be [41, 56, 71, 86]:

             41 <= "D" <= 55
             56 <= "C" <= 70
             71 <= "B" <= 85
             86 <= "A" <= 100
    """

    pass
def letter_grades ( highest ) : pass