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:
['t', 'Q', '5189', 'g', 'c', '4685', '5309', 'W', '6729', '2843']

Ex Output:
24755


Ex Input:
['8739', 'K']

Ex Output:
8739


Ex Input:
['9461', '6405', 'k', '6821', 'H', '43']

Ex Output:

22730