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]: ['4869', 'L']
[A]: 4869


[Q]: ['D', '5207', 'E', '119', 'g', '2991', 'G', 'g', 'u']
[A]: 8317


[Q]: ['2961', '4509', 'm', '4573', '969', 'A', '5591', 'a', '5509', '2867', '523', 'b', 'W', 'q', 'f', '2555', '6769', 'e', '5649', 'S']
[A]:
42475