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]: ['6815', 'A', '1055', '4687', '8675', '4615', 'a', '2127', 'w', 'l', 'J', '5025', 'c', 't', '9727', 'G', '8431']
[A]: 51157


[Q]: ['t', 'v', 'B', 'Y']
[A]: 0


[Q]: ['J', '6411', 'k', 'a', 'x', '5275', '951', 'n', '9737', '8029', 'O']
[A]:
30403