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]: ['D', 'P', '9951', '2897', 'V', 'C', 'B', 'H', 'c', 'h', '2843', 'a']
[EX A]: 15691

[EX Q]: ['m', '6153', 'A', '6173', 'x', '7527', '8501', 'g', 'r', 'K', 'I', '3103', '8347']
[EX A]: 39804

[EX Q]: ['P', 'Q', '2893', 'K', '2149', '3487', 'J', '4267', '9021']
[EX A]:
21817