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:
['q', 'N', 'y', '7859', 'u', '2861', '4151', 'Q', 'x']

Ex Output:
14871


Ex Input:
['U', '9593', '2079', '5959', 'T', '5849', 'w', 'b', '9743', '6689', 'k', 'J']

Ex Output:
39912


Ex Input:
['q', '6379', '1943', '1981', 'f', 'V', '6881', 'O', 'j', 'a', 'F', '8833', '3985', '9931', '3723', 'z', 'v', 'q']

Ex Output:

43656