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.

[EX Q]: ['4701', 'b', 'i', 'B', 'z', '7837', 'W']
[EX A]: 12538

[EX Q]: ['n', 'G', '5059', '8343', '8673', 'P', 'N', '5485', '2279', '6121', 'i', 'U', '7277', '8701', 'A', 'b', 'Z', 'R', '6371', 'G']
[EX A]: 58309

[EX Q]: ['5569', '5019', '3493', 'v', 'l', '2495', 'h', '7487']
[EX A]:
24063