HELP! writing a program

they program must take in 20 pupil names and what the got out of 100 in a test

then it should work out what grade the got and the highest

A>79
B>69
C>59
D>49
E>39
F>29

the result should be shown like this. note! 2=2 people got A

grading test
A 1
B 2
C 4
D 2
E 5
F 6
ian got the highes mark 80

NOTE! thanks in advance