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 Q]: ['w', '1335', 'G', 'h', '6729', '1999', 'u', 'I', 'r', 'm', '4757', 'W', '3715', '701', '1999']
[EX A]: 21235

[EX Q]: ['K', '5815', 'E', 'c', '7379', '4995', 'w', 'B', 'j', '6227', 'B', '733', '1491', '3191', '9413', '2751', 'O', 'J', '6239', '3521']
[EX A]: 51755

[EX Q]: ['y', '745', '6767', '209', 'h', '6395', '1759', '4665', '9905', '9921', 'm', '5701', '6655', 'A', 'A', '5599']
[EX A]:
58321