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:
['3873', 'D', 'J', '2799', 'k', 'F', 'I', '3457', '5647', '4815', '7509', 'Y', '1251', '2211']

Ex Output:
31562


Ex Input:
['3331', '5791', 'r', 'Q', '2243', '8229']

Ex Output:
19594


Ex Input:
['Z', 'v', '2059', '6295', '8885', '6897', '1081', 'K', '6059', 'U', 'v', '9919']

Ex Output:

41195