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.

['4089', '2385', 'E', 'K', '259', '295', '6649', '8645', 'n', '2577', '2683', '9041', 'Q', 'm', '4237']
40860

['y', 'F', '135', '7359', '8579', '6809', '3979', 'H', 'm', '5059', '373', 'Y']
32293

['W', '135', '2535', '1651', '3417']

7738