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

[EX Q]: ['2787', 'z', '9351', '3339']
[EX A]: 15477

[EX Q]: ['h', 'b', 'Q', '1897', '3767', '4197', '2411', '9623', '8847', 'X', 'Z', '8275', 'k', 'q']
[EX A]:
39017