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]: ['b', 'O', '7023', 'q', '2667', '681', 'C', '5707', '7125', 'q', 'Q', '1375', '8869', '6709']
[EX A]: 40156

[EX Q]: ['q', '5151', 'R', '441']
[EX A]: 5592

[EX Q]: ['h', '1715', 'E']
[EX A]:
1715