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:
['6907', '9123', 'L', '8871', 'q', 'C', 'U', '7403', 'F', '3827', '3951', '8879', '2865', 'x', '6175', 'T', '1147']

Ex Output:
59148


Ex Input:
['h', '6937', 'U', 'f', 'S', 'm', '9699', 'E', '4559', 'p', 'Z', 'o', '6409', 's', '4537', '5135', '6901', '6489', '5833', 'l']

Ex Output:
56499


Ex Input:
['a', '207', 'W', 'r', '6637']

Ex Output:

6844