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]: ['k', 'Z', 'r', 'K', 'b', 'X', 'A']
[A]: 0


[Q]: ['8147', '3191']
[A]: 11338


[Q]: ['3419', '3785', 'Y', '1587', 'c']
[A]:
8791