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]: ['V', 'O', '1309', 'm', '9333', '8283', 'Z', 'K', 'X', 'w', '9855', '9075', '2013', '8485', '9973', '8779']
[A]: 67105


[Q]: ['K', '8325', 'b', '4269', 'K', '1043', 'P', 'v']
[A]:
13637