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]: ['6563', 'R', 'M', 'B', 'b', 'E', '9911', '7327', 'J', '7389', 'w', 'b', 'c', '1527', 'K', 'r', '5441', '6823', '8455']
[EX A]: 53436

[EX Q]: ['B', 'u', '9227', 'b', '8767']
[EX A]: 17994

[EX Q]: ['5343', 'K', 'Q', '8669', '199', 'O', '4893', 'U', 'M', '4297']
[EX A]:
23401