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:
['t', '7015', '2239', 'I', 'F', 'E', '1363', '9615', '6179', '2539', 'z', '8745', '1319', '4715', '9071', 'K', '3707', '6149', 'd']

Ex Output:
62656


Ex Input:
['k', 'Z', 'r', 'K', 'b', 'X', 'A']

Ex Output:
0


Ex Input:
['9319', 'e', '991', '4719', '579', '1315', '5969', 'r', 'K', '3171', 'U', 'L', 'H', '6967', '5221', '2325', '1191', 'u', '9999', '2803']

Ex Output:

54569