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:
['7755', '8383', 'y', 'k', '4869', '2809']

Ex Output:
23816


Ex Input:
['q', 'I', 'E', 'M', 'T', 'i', '8719', 'r', 'V', '9759', 'I', '1793', 'Q', 'P', '5263', 'I', 'O', '8603', 'y']

Ex Output:
34137


Ex Input:
['5223', '5955', 'E', 'q']

Ex Output:

11178