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:
['7959', '1345', '4605', '6453', 'Q']

Ex Output:
20362


Ex Input:
['m', '6153', 'A', '6173', 'x', '7527', '8501', 'g', 'r', 'K', 'I', '3103', '8347']

Ex Output:
39804


Ex Input:
['3529', '9989', 'g', '5629', '1075', 'q', 'e', 'S', '911', 'N', 'o', '4065', '3899', '3603', 'U']

Ex Output:

32700