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]: ['6585', '5263', '9497', '1117', 'a', 'F', 'w', '6595', '547']
[A]: 29604


[Q]: ['x', '8955', 'w', '5529', '3291', 'e', '3007']
[A]:
20782