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]: ['C', 'v', '1353', 'e', 'x', 'A', 'D', '1243', '477', 'z', '3483', '5213', 'k', 'm', 'n']
[EX A]: 11769

[EX Q]: ['t', '7469', 'Y', 'N', '8137']
[EX A]: 15606

[EX Q]: ['8431', 'Q', '467', '27', 'B']
[EX A]:
8925