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]: ['2485', 'Q', 'G', '5533', 'Y', '21', 'D', 'S']
[EX A]: 8039

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

[EX Q]: ['H', 'B', 'o', 'o', '3053', '1075', 'T']
[EX A]:
4128