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]: ['7277', 'c', '9587', '2613', '853', 'w', 'y', '4067', 'o', 'u', 'j', 'W', '1517', 'x', 'Y']
[EX A]: 25914

[EX Q]: ['q', 'Y', '6021', '4045']
[EX A]: 10066

[EX Q]: ['C', 'n', 'J', '6369']
[EX A]:
6369