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:
['5289', '1701', '5925', '7973', 'F', 'V', 'y', '5903', 'i']

Ex Output:
26791


Ex Input:
['I', 'n', '3069', '477', 'F', 'k', '847', '6777', 'N', 'X', 'F', '1417', '9445', 'o', 'v', 'd', '2169', 'w']

Ex Output:
24201


Ex Input:
['Q', '3861', 'h', 'f']

Ex Output:

3861