Write a Python program that accepts three values from the user, converts each to float, and stores the values in three variables. The expected input values represent grades between 0.0 and 100.0. The program should then sum the three grades, and store the sum in another variable. Then the program should calculate the numeric average of the three. After calculating the average, the program should use Python conditional (if/elsif/else) statements to determine and print out a final letter grade

1) Assign the addition of the these three variables into a third sum variable

Calculate the average of the three numbers, and print out the average.

2) If the average of the three numbers >= 90.0 the program should print the text string Final grade is an A

If not an A, and if the average of the three numbers >= 80.0 the program should print the text string Final grade is a B

If not an A or a B, and if the average of the three numbers >= 70.0 the program should print the text string Final grade is a C

If not an A, B, or a C, and if the average of the three numbers >= 60.0 the program should print the text string Final grade is a D

3) If not an A, B, C, or a D the program should print the text string Ooops, please work harder