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]: ['R', '3361', 'c', 'S', 'g', '3829', '7347', '6633', 'e', '9227']
[EX A]: 30397

[EX Q]: ['2765', '6767', '7645']
[EX A]: 17177

[EX Q]: ['z', '5885']
[EX A]:
5885