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]: ['q', 'N', 'y', '7859', 'u', '2861', '4151', 'Q', 'x']
[EX A]: 14871

[EX Q]: ['7459', '491', '7823', '6965', 'H', '109', 'R', 't', '3959', '2821', 'R', '2807', 'o', 'v', '1305', 'a', '1411', 'r', '3669']
[EX A]: 38819

[EX Q]: ['8405', '4659']
[EX A]:
13064