$*7\mathrm{.}1($Assign grades$)$ Write a program that reads student scores, gets the best score, and then assigns grades based on the following scheme:

Grade is A if score is $$ best $-10$ ;

Grade is $B$ if score is $$ best $-20$ ;

Grade is $C$ if score is $$ best $-30$ ;

Grade is D if score is $$ best $-40$ ;

Grade is $F$ otherwise.

The program prompts the user to enter the total number of students, then prompts the user to enter all of the scores, and concludes by displaying the grades.