Cryptocracy Day 2 -- Axed

Aiden finally realizes what he was supposed to do while browsing the library and sits down in a quiet place to finally grade the papers. When he finishes, he realizes there's something wrong with them. He looks at one of them for a while before he realizes that the space where the name would go is gone!

"What the... that printing thing messed it up!" he grumbled to himself, "Or... I could have just forgotten to put name in the right place. Whoops." Aiden leaves the library and goes back to his house, wondering how he could figure out which paper is which. Not even one person had put their name on their paper!

"I guess I'll just post up the grades and they can figure out which grade corresponds to each person...," he muttered to himself as he walked into his house. He copied the grades from the papers onto a new sheet of paper in no particular order before exiting his house and posting the grades to the front of his door. The paper listed:

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SpoilerD-
C-
A+
D+
C
B
F
B+
A
C
A-
B-
D-
C+
B-
A
B+

with a note at the bottom that said, "No names were written on the papers, so I don't know whose grade is whose."

Aiden looked at the paper and wondered who got the lower grades. It would probably be very embarrassing to get one displayed to everyone. He probably should have remembered which handwriting corresponds to which person...