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]: ['s', 't', 'W', '163', 'v']
[EX A]: 163

[EX Q]: ['1875', '9833', 'i', '7493', 'J', 'P', 'z']
[EX A]: 19201

[EX Q]: ['m', 'b', 'z', '2309', '6483']
[EX A]:
8792