Write a function called attendance$\_$check. attendance$\_$check

#should have two parameters: roster and present. Both roster

#and present will be lists of strings. Return a list $($sorted

#alphabetically$)$ of all strings in the list roster that are

#not in the list present. In other words, if roster is a

#list of students enrolled in a class and present is a list

#of students in class today, return a list of students that

#are absent$.$