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:
['7215', 'd', 'q', 'k', '9301', 'P', 'x', 'C', 'g', 'e', 'o', '2769', '6993', '9769', 'v', '9007', '4131', '8627', 'q']

Ex Output:
57812


Ex Input:
['D', 'P', 'y', '4891', '1539', 'J', '5737']

Ex Output:
12167


Ex Input:
['2877', '3755', '3773', 'B', 'q', '6409', '4055', 'q', '971', '8583', 'j', 'g', 'W']

Ex Output:

30423