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]: ['U', '9593', '2079', '5959', 'T', '5849', 'w', 'b', '9743', '6689', 'k', 'J']
[EX A]: 39912

[EX Q]: ['a', 'm', '3205', '1869', '1117', 'K', '5785']
[EX A]: 11976

[EX Q]: ['v', '7215', 'e', 'X', 'Y', '9891', '443']
[EX A]:
17549