In this task, you are given an input list. A list contains several comma-separated items written within brackets. You need to return the count of all the alphabetical elements in the given list. Return 0 if no alphabetical element in the list
['2187', '5403', 'U', '9631', 'R', 'G', 'T', '1599', '4257', 'a', '9789', '5993', '3917', 'X', 'b', '5099', '7777', 'Z', 'A', '9633', 'W', '569', 'b']