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:
['l', 'B', 'Y', '7543', '5091', '1917']

Ex Output:
14551


Ex Input:
['3809', '9401', '63', '5705', 'u', '6275', 'k', 'l', '1171', '9365', 'L', 'O', '7431', '8567', 'h', '6135']

Ex Output:
57922


Ex Input:
['X', 'z', 'A', '6459', '1967', '1667', '5957', 'h', 'L', 'n', 'P', '2571', '5423', '9313', 'm', '8943']

Ex Output:

42300