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]: ['1203', '6179', '9835']
[EX A]: 17217

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

[EX Q]: ['h', 'a', '1645', '2391', '759', '519', '3331', '2831', '3427', '9893', 'u', 'J', '7391', '8379', 'V']
[EX A]:
40566