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]: ['6469', '3027', 'Z', '3353', 'a', 'S', '3879', '8471', 'H', 'I', 'y', '2661', '9007', 'D']
[EX A]: 36867

[EX Q]: ['6585', '5263', '9497', '1117', 'a', 'F', 'w', '6595', '547']
[EX A]: 29604

[EX Q]: ['8811', '2169', '3333', '1337', 'R', '4803', 'A', '9773', '8973']
[EX A]:
39199