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]: ['8147', '3191']
[EX A]: 11338

[EX Q]: ['Q', '6383', 'P', '8455', '3881', '5821', 'e', 'v', '1421', 'Q', '6377', '3157', '6407', 'q']
[EX A]: 41902

[EX Q]: ['G', 'm', 'n']
[EX A]:
0