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:
['6321', 'M', 'd', '3673']

Ex Output:
9994


Ex Input:
['1969', 'm', 'Y', 'N', '7331', 'J', 'b', '2485', 'x']

Ex Output:
11785


Ex Input:
['D', 'b', 'h', 'p', '1637']

Ex Output:

1637