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]: ['4201', '6445', '4009', 'q']
[EX A]: 14655

[EX Q]: ['5289', '1701', '5925', '7973', 'F', 'V', 'y', '5903', 'i']
[EX A]: 26791

[EX Q]: ['1303', '9957', '7151']
[EX A]:
18411