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:
['4529', '7465', 'S', 'Z', 'v', 'w', '5791', '3363', '2643']

Ex Output:
23791


Ex Input:
['Q', '6383', 'P', '8455', '3881', '5821', 'e', 'v', '1421', 'Q', '6377', '3157', '6407', 'q']

Ex Output:
41902


Ex Input:
['t', 'l', 'f', '5419', 'q', 'q', '1283', 'Z', 'R', '3047', '5121', 'r', '7817', 'y', 'K', 'h']

Ex Output:

22687