Calculate the average of an arbitrary number of course marks. This average should only include courses the student has passed, i.e., courses with a mark of 50 or higher.

Write a Python script that will:

• input integer grades from a user (using the input() function) until the user enters an empty string (i.e., just presses Enter),

• compute the average of all marks greater than 49 and

• store this average, rounded to the nearest integer, in a variable called average