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]: ['X', '6189', '5435', 'y', '8931', '8987', 'F', '8377', 'k', '8631', '8717', 'q', '2923', 'g', '7225', 'j']
[EX A]: 65415

[EX Q]: ['6731', 'f', '4561', '5601', 'i']
[EX A]: 16893

[EX Q]: ['I', 'U', 'e', '7035', '303', 'd', 'h', '5525', 'L', 'B']
[EX A]:
12863