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]: ['g', 'h', '9141', '7825', 'a', 'u', '2389', 'r', '9739', '8337', 'Z', 'Z', '6717']
[A]: 44148


[Q]: ['Q', '1669']
[A]: 1669


[Q]: ['K', 'b', 'w', '6189', '3293', 'G', '2069', '4575', '7829', '9135', 's', '1677', '9771', '1357', '8299', '7011', '3361']
[A]:
64566