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]: ['4869', 'L']
[A]: 4869


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


[Q]: ['E', '83', 'F', '4787', '1567', '87', '1497', 'z', '3017', 'U', 'p', '9977', 'X', '2879', 'o', 'I', '4711', '9127', '4273', 'b']
[A]:
42005