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]: ['B', 'K', '9399', 't', '5541', 'w', '1939', '7841', 'q']
[A]: 24720


[Q]: ['6645', 'k', '4879', 'N', '113', 'L', 'x', '8365', 'v', 'A']
[A]: 20002


[Q]: ['U', '9057', '443', 'k', '1811', 'p', 'c', 'H']
[A]:
11311