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]: ['Q', '8317', '8989']
[A]: 17306


[Q]: ['9403', '2607', 'G', '7901', 'K', '7967', 'a', 'n', '1967', 'x', 'g', '1081']
[A]: 30926


[Q]: ['M', '4549', '8955', '5485', '823', '2431', 'e', '2899', 'a', 'r', 'n', 'S', 'A', '6855', '7707', 'e', '7569']
[A]:
47273