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:
['h', '2335', '2669', '6035', '9901', '7721', 's', '6181', 'C', 'l', 'x', '8275', '1103', 'S', '6447']

Ex Output:
50667


Ex Input:
['8669', '9115', '2573', '9261']

Ex Output:
29618


Ex Input:
['7553', '9755', 'D', '5123']

Ex Output:

22431