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', '6729', 'p', 'D', 'o', '1213', 'e', '6951', '2341', '9997', 'e', 'M', 'x', 'R']
[A]: 27231


[Q]: ['K', '4403', 'a', '3881', '4139', 'w', '1861', 'G']
[A]: 14284


[Q]: ['8981', '4719', '2699', '9833', 'n']
[A]:
26232