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:
['X', 'P', 'x', '9471', '5', 'c', 'f', '5077', '1085', '2267', 'R', 'q', '4987', '9529', 'H', 'n', 'r', 'u']

Ex Output:
32421


Ex Input:
['6469', '3027', 'Z', '3353', 'a', 'S', '3879', '8471', 'H', 'I', 'y', '2661', '9007', 'D']

Ex Output:
36867


Ex Input:
['6499', 'Z', 'm', '9583', '1011', 'A', '3493', 'y', '6183', '2377', '4069', 'R', 'K', 'z', '5497', '1441', 'V', 'u', 'j']

Ex Output:

40153