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]: ['R', 'J', 'z', 'o', '1121', '7247', '8987', 'u']
[A]: 17355


[Q]: ['6663', '3485', '2207', '9357', '2723', '7775', 'B', '7479', '1607', 'A', 'G', '2133', 'M', 'Q', '9227']
[A]:
52656