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]: ['D', 'm', 'P', '2433', '6731']
[EX A]: 9164

[EX Q]: ['8809', '4559', '2715', 'w', '9903', 'h', 'u', 'F', '9369', '6149']
[EX A]: 41504

[EX Q]: ['6557', '981', 'o', '1997', '27', '267', 'm', '9749', '85', 'O', '7577', 'M']
[EX A]:
27240