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.

Ex Input:
['6469', '3027', 'Z', '3353', 'a', 'S', '3879', '8471', 'H', 'I', 'y', '2661', '9007', 'D']

Ex Output:
36867


Ex Input:
['5095', '8235', '4901', 's', '4177', '3077', 'l']

Ex Output:
25485


Ex Input:
['K', 'M', 'j', 's', '2231', '7241', 'E', '1647', 'G', '1471', '5419', '5147', '7693', '9261', 'X', '2161', 'R', '1887', 'U', '1269']

Ex Output:

45427