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:
['6565', 'T', 'O', '2901', '5121', 'y', '9617', 't', '7825']

Ex Output:
32029


Ex Input:
['901', 'X', 'W', 'D', 'm', 'M', '59', '4855', '6523', 'R', '9781', '8271', '4449', '2221', '8391']

Ex Output:
45451


Ex Input:
['k', '8609', '4319', '9433']

Ex Output:

22361