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:
['K', '479', 'u', '3489', 'o', '9589', '7153', '7649', '123', 'a', 'A', '3951', '847', 'N', 'R', '947', '9243', 'G', 'a']

Ex Output:
43470


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

Ex Output:
11785


Ex Input:
['8113', '203', '5413', '2647', '7499', 'K', 'F', 'n', '1189', 'y', '9843', 'h', 'm', 'R', '6433', 'z', 'D']

Ex Output:

41340