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.
['6313', '5151', '7061', '189', 'J', 'T', '885', '4429', '8553', '1459', '4779', '1665', '4693', '6023', '6629', 'm', '1395', '9927', 'q']