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]: ['a', 'f', '2185', 'N', '6381', '6429', '7499', 'd', '757', 'k', 'k', 'b', 'N', '2697', 'A', '8037']
[EX A]: 33985

[EX Q]: ['6019', '1467', '3415', '7785']
[EX A]: 18686

[EX Q]: ['l', '4323', 'L', 'Y', '1621', 'f', 'C', '3501', '1801', 'Y', 'w', '5435', '3373', '483', '8685', '21', 'w', 'j', 'R']
[EX A]:
29243