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]: ['I', 'J', 'K', 'D', '5961']
[EX A]: 5961

[EX Q]: ['5499', '39', 'Q', 'b', 'W', '7155', '2515']
[EX A]: 15208

[EX Q]: ['9975', '2649', '3499', 'n', '7621', '8205', 'J', 'I', 'E', 'O', 'P', 'q', '2235', 'B', 'v', 'B', '9777', '9651', 'G', 'N']
[EX A]:
53612