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:
['7459', '491', '7823', '6965', 'H', '109', 'R', 't', '3959', '2821', 'R', '2807', 'o', 'v', '1305', 'a', '1411', 'r', '3669']

Ex Output:
38819


Ex Input:
['P', '237', 'X', '8893', '7931', 'F', '8359', 'S', '6931', '6953', 'r']

Ex Output:
39304


Ex Input:
['3749', 'v', 'a', '8881', '1091', 'V', 'Q', '6443', '4677', '5903', '8839', 'm', 'L', 'I', '5103']

Ex Output:

44686