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]: ['A', '771', 'Q', 'b', '9929', '4991', 'q', '9863', '4363', '5721', 'C', '991', 'j', 'r', 'Q', 'B', 'K']
[EX A]: 36629

[EX Q]: ['2039', '1679', '9675', 'S', 'J', '2069', 'r', 'e']
[EX A]: 15462

[EX Q]: ['7795', 'S', '8131', '5185']
[EX A]:
21111