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.

['K', '5815', 'E', 'c', '7379', '4995', 'w', 'B', 'j', '6227', 'B', '733', '1491', '3191', '9413', '2751', 'O', 'J', '6239', '3521']
51755

['G', 'o', 'g', 'I', 'S', '9193', 'G', 'C', '2481', '435', 'm', '1005', '5605', '6501', 'D']
25220

['b', '9625', '239', 'l', '6915', 'n', 'Z', 'k', '5109', 'v', 'w', '7065', 'F', 'r', '4805', '4451', '9111', 'r', 'C']

47320