It says under instructions...
AADSAS Grade
CONVERT the grade on your transcript to the correct standardized letter grade. Check the grading scheme on your transcript to determine the equivalent letter grade. If it is a non-graded course, select "None." (In most situations, the letter grade on your transcript will be the same as your AADSAS grade. Your AADSAS grade will be different if your transcript uses a numbering system, or some other non-traditional grading system.)