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]: ['3121', 'j']
[A]: 3121


[Q]: ['q', 'Y', '6021', '4045']
[A]: 10066


[Q]: ['R', 'g', 'g', '2691', '2411', 'z', '3785', '11', '7055', 'W', 's', '2577', 't', 'g']
[A]:
18530