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]: ['O', '6337', 'j', '6009', 'z']
[EX A]: 12346

[EX Q]: ['O', '9829', '5265', 'U', 'z', '2843', '1483', '9293', '1327', '2015']
[EX A]: 32055

[EX Q]: ['8169', '5461', '9969']
[EX A]:
23599