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', '9979', '8723', '1131', 'i', 'p', 'M']

Ex Output:
19833


Ex Input:
['V', '2633', '3269', 'r', 'Q', '3517', '2571', 'G', '4105', 'm', 'z', 'B', 'A']

Ex Output:
16095


Ex Input:
['e', 'b', 'k', '8307', '6013']

Ex Output:

14320