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]: ['F', 'z', '1159', '345']
[EX A]: 1504

[EX Q]: ['a', 'f', '2185', 'N', '6381', '6429', '7499', 'd', '757', 'k', 'k', 'b', 'N', '2697', 'A', '8037']
[EX A]: 33985

[EX Q]: ['1545', 'M', '385', '5977', 'b', 'i', 'k', '769', '1117', '4523', 'D', '5063', '619', '4767', '8303', '8769', '659', '9839']
[EX A]:
52335