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]: ['1693', '9237', '7591', '1593', 'R', '6295', '9379']
[EX A]: 35788

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

[EX Q]: ['595', 'e', '157']
[EX A]:
752