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]: ['b', '5447', 'R', '8489', 'L', '627', 'P', '7491', 'c', 'c', 'r', '6923', '1167']
[EX A]: 30144

[EX Q]: ['3107', 'D', '9595', '8807', 'Q', 'o', 'T', 'N', 'A']
[EX A]: 21509

[EX Q]: ['581', 'o', 'J', '6249', 'N', '2959', 'x', 'U', '647', 'r', 'h', '2789', '7397', 'n']
[EX A]:
20622