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]: ['7771', 'g']
[A]: 7771


[Q]: ['j', 'R', '2435']
[A]: 2435


[Q]: ['B', 'O', '3359', 'V', 'D', 'Z', '3503', 's', 'k', 'A', 'p', '2795']
[A]:
9657