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]: ['t', 'Q', '5189', 'g', 'c', '4685', '5309', 'W', '6729', '2843']
[EX A]: 24755

[EX Q]: ['6161', 'p', '2839', 'c', '5905', '1729', 'j', '5901', '3013', 'e']
[EX A]: 25548

[EX Q]: ['5573', '6221', 'C', '8649', '6603', 'q', '9403']
[EX A]:
36449