Write a program in java that calculates the grades for a course. Your program should prompt the user for the name of a file that stores exam scores. Each line of the file has the following format:

LastName:FirstName:Exam$1$:Exam$2$:Exam$3$

The exams are to be weighted $25\%$ for the first exam, $30\%$ for the second exam, and $45\%$ for the third exam. Based on that, a final grade is to be assigned: A if the total is at least $90,$ B if it is at last $80,$ C if it is at least $70,$ D if it is at least $60,$ and F otherwise. The highest grade based on the total points is always assigned, so a $75$ gets a C$.$ Your program should output to the terminal a list of students with the letter grade, as follows:

LastName FirstName LetterGrade

It should also output to a file, whose name is provided by the user, lines of the form

LastName FirstName Exam$1$ Exam$2$ Exam$3$ TotalPoints LetterGrade

After it is done, it will output the grade distribution. If the input is

Doe:John:$100$:$100$:$100$

Pantz:Smartee:$80$:$90$:$80$

Then the terminal output is

Doe John A

Pantz Smartee B

And the output file will contain

Doe John $100100100100$ A

Pantz Smartee $80908083$ B

A $1$

B $1$

C $0$

D $0$

F $0$