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]: ['B', 's']
[EX A]: 0

[EX Q]: ['5289', '1701', '5925', '7973', 'F', 'V', 'y', '5903', 'i']
[EX A]: 26791

[EX Q]: ['4519', '2363', 'x', 'Q', '4853', 'L', '6137', 'V']
[EX A]:
17872