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]: ['X', '6189', '5435', 'y', '8931', '8987', 'F', '8377', 'k', '8631', '8717', 'q', '2923', 'g', '7225', 'j']
[EX A]: 65415

[EX Q]: ['d', '4553']
[EX A]: 4553

[EX Q]: ['6905', 'm', 'W', 'R', '7109', 'n', 'J', '6147', 'R', 'r', 'i', '745']
[EX A]:
20906