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]: ['n', 'u', '9595', 'M', 'o', 'K', '5073', 'x']
[A]: 14668


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


[Q]: ['a', '3733', 'Y']
[A]:
3733