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]: ['Y', '8169', '9067']
[EX A]: 17236

[EX Q]: ['8809', '4559', '2715', 'w', '9903', 'h', 'u', 'F', '9369', '6149']
[EX A]: 41504

[EX Q]: ['5207', 'n', '6491', '527', '9315', '9377', 'y']
[EX A]:
30917