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', 'N', 'y', '7859', 'u', '2861', '4151', 'Q', 'x']
[EX A]: 14871

[EX Q]: ['D', '8591', 'b', 'n', 'e', '883', '8923', '245', 'z', '5643', 'C', '2911', '9275', '711', '7299', '3449', '4799', '6065']
[EX A]: 58794

[EX Q]: ['2039', '1679', '9675', 'S', 'J', '2069', 'r', 'e']
[EX A]:
15462