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', '8137', 'b', 'k', '2081', 'L', '9733', '7525', 'D', '2381', 'O']
[EX A]: 29857

[EX Q]: ['9989', 'B', 'E', '5181']
[EX A]: 15170

[EX Q]: ['D', 'U', '4645', '7471', 'G', '2037', 'M', 'b', '441', 'V', '2025', 'J', '4739', '1433', 'A', '6081']
[EX A]:
28872