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:
['w', '2281', '8651', '2203', 'q', 'n', '4253']

Ex Output:
17388


Ex Input:
['2469', 'c', '6931', 'a', '2167', '9493', '9403', '4123', '4949', 'R', 'V', 'h', '315', 'T', '9411', 'M', '1329', '8217', '6105', 'Y']

Ex Output:
64912


Ex Input:
['8391', 'D', '261', '7003', 'K', '4049', '2521']

Ex Output:

22225