What is the name of every college in alphabetical order that has more than 18000 students enrolled?
return colleges ;return students enrolled in #1 ;return number of  #2 for each  #1 ;return #1 where #3 is  higher than 18000 ;return names of  #4 ;return #5 sorted by alphabetical order
['select', 'project', 'group', 'comparative', 'project', 'sort']