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]: ['s', '425', '6135']
[EX A]: 6560

[EX Q]: ['Q', '8317', '8989']
[EX A]: 17306

[EX Q]: ['Q', 'u', '8537']
[EX A]:
8537