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]: ['3683', 'U', 'x', '313', 'n', '3837', '3299', '2081', '2773', 'r', 'O', '257', '6647', '585', 'o']
[EX A]: 23475

[EX Q]: ['G', 'o', 'g', 'I', 'S', '9193', 'G', 'C', '2481', '435', 'm', '1005', '5605', '6501', 'D']
[EX A]: 25220

[EX Q]: ['6195', 'd', 'h', '6725', '7199', 'H', 'Q', '9697', 'C', '5897', '841', 'k', 'q', '1787', 't', 'G', '3655', '5727', '7839', '8943']
[EX A]:
64505