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]: ['6469', '3027', 'Z', '3353', 'a', 'S', '3879', '8471', 'H', 'I', 'y', '2661', '9007', 'D']
[A]: 36867


[Q]: ['3319', '575', '7497', '2679', 'h', 'p', 'N', 'y', '9291', 'Z', 'w', '7381', 'x']
[A]:
30742