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]: ['9403', 'u', '4159', 'w', '3467']
[A]: 17029


[Q]: ['9989', 'B', 'E', '5181']
[A]: 15170


[Q]: ['6937', 'k', '8993', 'r', '6301']
[A]:
22231