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]: ['9401', 'w', 'b', '8287', 'n', 'O', 'H', 'h', '45', '2337']
[EX A]: 20070

[EX Q]: ['W', 'H', 'k', 'L', '2425']
[EX A]: 2425

[EX Q]: ['2013', 'S', 's', '9353', 'b', 'u', '6687', '5429', '3545', '7269']
[EX A]:
34296