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]: ['6645', 'k', '4879', 'N', '113', 'L', 'x', '8365', 'v', 'A']
[EX A]: 20002

[EX Q]: ['q', '867', 'e', 'z']
[EX A]: 867

[EX Q]: ['5003', 'm']
[EX A]:
5003