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]: ['2787', '6085', '6989']
[EX A]: 15861

[EX Q]: ['a', 'q', '4085', '6327', '6869', 'Z', 't', '7057', '1965', 'p', 'o']
[EX A]: 26303

[EX Q]: ['m', '9611', 'f', '5229', 'Q', '4845', '3219', 'E', '9391', 'M', '2125', 'b', '4621']
[EX A]:
39041