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:
['6515', '5525', 'o', 'Q', '9049', 'f', 'p', 'X', '2057', 'h', '7585', '3617', '7817']

Ex Output:
42165


Ex Input:
['v', 't', 'a', 'r', 'O', 'I']

Ex Output:
0


Ex Input:
['U', '995', '1471', '5535', '7601', 'Y', '8337', '8167', 'i', '8711', 'D', 'a']

Ex Output:

40817