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]: ['V', '2633', '3269', 'r', 'Q', '3517', '2571', 'G', '4105', 'm', 'z', 'B', 'A']
[EX A]: 16095

[EX Q]: ['8821', '7221']
[EX A]: 16042

[EX Q]: ['3275', 'a', '4845', 'R', 'W', '405', '1845', '9359']
[EX A]:
19729