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:
['2087', '8171', 'c', 'd', 'a', '5621', 'n']

Ex Output:
15879


Ex Input:
['3351', '6445', 'Y', '8455', 'V', 'z', 'a', 'V', 'S', '8551', '4101', 'q', '8743', '5999', '7155', '3825', '2241', '9957']

Ex Output:
68823


Ex Input:
['9821', 'w', '5147', '3201', '1309', '7223', 'h', 'B']

Ex Output:

26701