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]: ['q', 'U', 'I', '5245', 'g', 'Y', 's', 'V', 'b', 'V', 'D', '1193', 'p']
[EX A]: 6438

[EX Q]: ['1671', 'H', '9271']
[EX A]: 10942

[EX Q]: ['f', '3693', '5337', '2639', 'k', '651', 's', 'i', '391', 'R', '9579', '3007', '8187', 'a', 'g', '929', '9335', '5979', '5455']
[EX A]:
55182