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]: ['v', 't', 'a', 'r', 'O', 'I']
[EX A]: 0

[EX Q]: ['g', 'A', 'r', '539', '5459', '2725', '7447', '3693', '1757', 'r', 'W', '5949', '4569', '5153', '3985', 'Q', '505', 'M', '8989']
[EX A]: 50770

[EX Q]: ['8571', 'E', '1845', 'q', 'F', 'g', 'U', '8103']
[EX A]:
18519