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]: ['8591', 'J', 'l', 'l', '7023', 'N', 'n']
[EX A]: 15614

[EX Q]: ['D', 'b', 'h', 'p', '1637']
[EX A]: 1637

[EX Q]: ['C', 'Q', '8745', 'z', '9417', 'i', 'v', '3691', 'Q']
[EX A]:
21853