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:
['6849', 'I', 'p', 's', 'L', '4757', 'j', 'x', 'm', 'P', '5237', '1105', '9015', '9279', 'Q']

Ex Output:
36242


Ex Input:
['x', '1305', 'b', '8193']

Ex Output:
9498


Ex Input:
['z', 'o', 'a', 'Y']

Ex Output:

0