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]: ['5215', 'c', '839', 'V']
[A]: 6054


[Q]: ['D', '5207', 'E', '119', 'g', '2991', 'G', 'g', 'u']
[A]: 8317


[Q]: ['5743', '9361', '9443']
[A]:
24547