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:
['1969', 'm', 'Y', 'N', '7331', 'J', 'b', '2485', 'x']

Ex Output:
11785


Ex Input:
['W', 'S', 'r']

Ex Output:

0