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:
['4201', '6445', '4009', 'q']

Ex Output:
14655


Ex Input:
['3121', 'j']

Ex Output:
3121


Ex Input:
['Z', 'u', 'h', '2893', 'g', 'Z', '7469', '11', '4139', '2991']

Ex Output:

17503