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:
['191', 'R', 'Q', '7809', '4851', 'b', 'e', 'H', 'E', 'I', 'r', 'A', 'g', 'e', 'g', 'I', 'j', 'f', '7287']

Ex Output:
20138


Ex Input:
['457', '173', '6807', 'o', '555', 'l', 's', 'Z', 'm', '3035', '1283', '5645', 'S', '8641', 'J', 'Z', 'z', 'K']

Ex Output:
26596


Ex Input:
['9857', 'K', 'c', '1637', '2027', 'V', '9161', 'n', '5771', 'd', '3929', '4711', 'C', '741', '6107', '5827', 'r']

Ex Output:

49768