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]: ['6957', '4603', '5299', '8451', '9803', 'b']
[EX A]: 35113

[EX Q]: ['5289', '1701', '5925', '7973', 'F', 'V', 'y', '5903', 'i']
[EX A]: 26791

[EX Q]: ['2561', '7381', 'L', 'T', 'r', 's']
[EX A]:
9942