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.
['8223', 'z', 'v', '5181', '2441', '9811', 'D', 'L', '5575', '3751', '3629', '5161', 'e', '7651', 'q', '7207', 'f', 'O', 'Q', 'T']