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:
['8755', 'A', '2893', '6703']

Ex Output:
18351


Ex Input:
['1709', 'S', 'w', '7725', 'Z', '7755', '8081', '897', 'N', '4449', 'F', 'F', 'M', 'y', 'B', 'h', 's', 'l', 's', '415']

Ex Output:
31031


Ex Input:
['q', 'b', '5267', 'n', 'R', 'o', '3859', '2615', '1123', 'K', '6827', 'F', 'w', 'P']

Ex Output:

19691