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:
['D', '1693', 'f', 'B', 'o', '3947', '8667', 'f', '6721', '4191', '79']

Ex Output:
25298


Ex Input:
['k', '6555', 'L', '7549', 'W', 'y', 'y', '8817', 'J', 't', 'X', 'M', 'N', 'G', '7441', '283']

Ex Output:
30645


Ex Input:
['7659', 'l', '5911', 'u', '2169', 'x', '1991', '357', 'D', '7777', 'o']

Ex Output:

25864