In python, Write a program that asks the user to enter five test scores. The program should display a letter grade for each score and the average test score. Write the following functions as part of the program:

calc_average: This function should accept five test scores as arguments and return the average of the scores.

determine_grade: This function should accept a test score as an argument and return a letter grade for the score based on the following grading scale.

Score	Letter grade
90-100	A
80-89	B
70-79	C
60-69	D
Below 60	F