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:
['8667', '4129', '7075', '6345', '1315', 'M', 'F', '9073']

Ex Output:
36604


Ex Input:
['Q', '2271', '1803', '2363']

Ex Output:
6437


Ex Input:
['6715', 'W', 'a', 'k', 'K', 'p', '5283', 'O', 'e', '3141', 'c', 'B', 'T', 'Y']

Ex Output:

15139