Letter Grades

Your client teaches a course and needs scores turned into grades. The grading scheme is a boundary table: each row gives the minimum score for a grade, sorted from lowest to highest. A score earns the grade on the last row whose minimum is less than or equal to it. The lowest minimum is always low enough to catch every score.

Produce the grade for each score, one row per score, aligned with the input. The grader swaps in different schemes and score lists — different cutoffs, different labels, different lengths — so read both tables and cover the whole OUTPUT range: empty score rows must produce empty output rows.