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', '6383', 'P', '8455', '3881', '5821', 'e', 'v', '1421', 'Q', '6377', '3157', '6407', 'q']
[A]: 41902


[Q]: ['61', '5695', 'u', '253', 'n', '1035', 'd', '3017']
[A]: 10061


[Q]: ['a', '7729', '3657', '4505', '151', 'e', '3047', 'R', 'b', '5289', '4219', 'Z', '6031', '6793', '2017', '3405', 'u', '2897', '5525', '8969']
[A]:
64234