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

[EX Q]: ['z', '9173', 's', '8937', 'h', '1881', '7929', 'b', '2441']
[EX A]: 30361

[EX Q]: ['3057', '4023', 'v', '1517', '6515', '4759', '7061', '1027', '1683', '6201', 'P']
[EX A]:
35843