Modify the program for the last to also generate a class summary stating the number of students receiving each letter grade in the following format: A = number of students receiving A, B = number of...

Modify the program for the last to also generate a class summary stating the

number of students receiving each letter grade in the following format:

A = number of students receiving A,

B = number of students receiving B,

C = number of students receiving C,

D = number of students receiving D,

F = number of students receiving F.