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.

[Q]: ['i', 'C', '5373', '2017', 'm', '5435', 'Y', 'h']
[A]: 12825


[Q]: ['S', '1249', '6233', 'I', '6733', 'r', 'A', 'E', 'h', 'x', 'p', 'c', '515', '1029', '1593', '1035']
[A]: 18387


[Q]: ['943', 'h', 'e', '7303', '719', '8671', 'f', 'n', 'b', 'P', '7593', 'x', '1391', 'L', 'O']
[A]:
26620