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]: ['K', '4403', 'a', '3881', '4139', 'w', '1861', 'G']
[EX A]: 14284

[EX Q]: ['g', 'A', 'r', '539', '5459', '2725', '7447', '3693', '1757', 'r', 'W', '5949', '4569', '5153', '3985', 'Q', '505', 'M', '8989']
[EX A]: 50770

[EX Q]: ['2703', 'B', 'J', 'S', '2773', 'R', 'H', 'v', '9689', 'r', '55', 'L']
[EX A]:
15220