In this task, you are given an input list A. You need to find all the elements of the list that are numbers and calculate their sum.
['9215', 'q', '5075', '9077', '1029', 'R', '9401', '4599', '9255', '9889', '597', 'v', 'j', 'O', '6751', '9291', 'A', '4059', 'A']