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:
['a', 'f', '2185', 'N', '6381', '6429', '7499', 'd', '757', 'k', 'k', 'b', 'N', '2697', 'A', '8037']

Ex Output:
33985


Ex Input:
['5215', 'c', '839', 'V']

Ex Output:
6054


Ex Input:
['8773', '2237', '265', '1323', '6541', 'w', '9765', '5143', '8629', '4789', '4963', 'p', '5085', 'D', '6075', '3085', 'b', '7381', 'D', 't']

Ex Output:

74054