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]: ['x', '1305', 'b', '8193']
[EX A]: 9498

[EX Q]: ['1391', '1719', '8547', 'x', 'a', 'j', '6395', 't', '3421', '6607', 'M', '1645', 'H', 'x', 't']
[EX A]: 29725

[EX Q]: ['w', 'W', 'T', '3621', 'n', 'u', 'g', '2509', '1203']
[EX A]:
7333