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:
['g', 'A', 'r', '539', '5459', '2725', '7447', '3693', '1757', 'r', 'W', '5949', '4569', '5153', '3985', 'Q', '505', 'M', '8989']

Ex Output:
50770


Ex Input:
['y', 'p', '3553', '2155', 'b', 'R', 'j', 'V', 'U']

Ex Output:
5708


Ex Input:
['x', 'm', '3837', 'x', 't', 'm', '6883', '1381', 'j', 'a', '2511', 'k', '3411', '9401', '9063', '5897', '9971']

Ex Output:

52355