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:
['4701', 'b', 'i', 'B', 'z', '7837', 'W']

Ex Output:
12538


Ex Input:
['4811', 'Q', '2289', 'N', 'I', '7681', 'z', '8179', '3359', '5299', 'R', 'z', '8697', '5781', '4803', '2715', '6511', '1371']

Ex Output:
61496


Ex Input:
['l', '3299', '7289', '6303', 'U', 'J', 'x', '2131', 'C', 'Y', 'Y', 'X', 'Z', '811', '4401', 'p', 'N']

Ex Output:

24234