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:
['r', '6537', '3001', '7879']

Ex Output:
17417


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

Ex Output:
25220


Ex Input:
['W', 'm', '7059', 'Q', '769', '1243', '7559', 'm', '13', '9379', 'J', 'y', '8545']

Ex Output:

34567