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]: ['2975', '33', '2845', '4695', 'j', '607', 'e', 'z', '6339', '1899', 'q', 'O']
[EX A]: 19393

[EX Q]: ['3557', '3345', '307', '9791', '1897', 'O']
[EX A]: 18897

[EX Q]: ['O', '8819', 'G', '607', '4129', 'a', '6531', 'q', '7749', '5165', 'Z']
[EX A]:
33000