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]: ['K', '4403', 'a', '3881', '4139', 'w', '1861', 'G']
[EX A]: 14284

[EX Q]: ['3575', '8877', '3231', 'v', '9083', '317', 'M', '8975', 'x', 'F']
[EX A]: 34058

[EX Q]: ['M', '2503']
[EX A]:
2503