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]: ['p', 'V', '673', '8483', 'S']
[EX A]: 9156

[EX Q]: ['v', 'Y', '4135', '8645', '263', '5377', '8677', 'Z', 'W', 'g', 'n', 'r', 's', '8513', '5677', 'u', '3033', 'I']
[EX A]: 44320

[EX Q]: ['5387', '6515']
[EX A]:
11902