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]: ['L', 'i', '9225', 'w', '5365', '8077', '2733', 'W', '8493', 'B']
[EX A]: 33893

[EX Q]: ['x', '1305', 'b', '8193']
[EX A]: 9498

[EX Q]: ['8201', 'q', 'J', '6845', '3441', 'U', 'c', 'o', '5673', '709', '2425', 'i', '273']
[EX A]:
27567