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:
['7771', 'g']

Ex Output:
7771


Ex Input:
['d', 'b', 'W', '3201', 'C', 'o', '5187', '9723', '8177', 'F', '6703', 'U', '1393', '1035', '3507', '5993', '3857', 'r', 'C', 'j']

Ex Output:
48776


Ex Input:
['7503', '4903', '6255', 'f', '6847', 'Z', '1403', 'X', '2745', '8743', '6913', '4897', 'M', '5037', '1579', 'I', 'o']

Ex Output:

56825