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:
['3433', '6955', 'Q', 'E', '3557', 'S', '2931', '9879', 'S', 'f', 'Q']

Ex Output:
26755


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

Ex Output:
11785


Ex Input:
['r', '2709', 'R', '685', 'u', 'h', '6397', 'g', '7695', '2855', '2749', '2819', '8327', 's']

Ex Output:

34236