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]: ['D', 'P', '9951', '2897', 'V', 'C', 'B', 'H', 'c', 'h', '2843', 'a']
[EX A]: 15691

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

[EX Q]: ['1185', '9845', 'f', '229', '1511', '1629', '1631', 'u', 'o']
[EX A]:
16030