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]: ['v', '3135', 'J', 'm', 'a']
[EX A]: 3135

[EX Q]: ['w', 'I', 't', '813', 'K', '5785']
[EX A]: 6598

[EX Q]: ['R', 'g', '1365', '3885', 'B', '8527', '9313', '5835', 'P', 'J', 'A']
[EX A]:
28925