Given the percentage grade for the course, calculate and return the letter grade that would appear in the Ryerson grades transcript, as defined on the page Ryerson Grade Scales. The letter grade should be returned as a string that consists of the uppercase letter followed by the possible modifier "+" or "-" .
Input: Int. Percentage grade.
Output: Str. The letter grade.
The initial code contents grade table as raw string. Fell free to change it in any way
ryerson_letter_grade(45) == "F" ryerson_letter_grade(62) == "C-"
Precondition: argument can be from 0 to 150
The mission was taken from Python CCPS 109 Fall 2018. It is taught for Ryerson Chang School of Continuing Education by Ilkka Kokkarinen