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]: ['6321', 'M', 'd', '3673']
[EX A]: 9994

[EX Q]: ['f', 'F', 'E', '2279', 'r', '6419', 'd', 'M', '3975', '3797', '9201', 'F', 'c', '4753', '959', 'v', '8963', '4007']
[EX A]: 44353

[EX Q]: ['6347', 'q', 'y', 'r', 'T', '8957', 's', 'q', 'F', 'h', 'W', 'm', 'R', 'Y', 'z', 'w', 'h', '7141', '5997', 's']
[EX A]:
28442