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]: ['2175', '4539', 'L', 'T', 'q', '2407', 'F', 'V', 'b', '9475', '2279', '4469', '6231']
[EX A]: 31575

[EX Q]: ['d', '5571', '6455', '4287', 'I', 'U', 'M', '8303', '8893']
[EX A]: 33509

[EX Q]: ['W', '8685', 'q', '2893', 't', '1041', 'I', 'L', 'p', '1487', '813']
[EX A]:
14919