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 Input:
['R', 'J', 'z', 'o', '1121', '7247', '8987', 'u']

Ex Output:
17355


Ex Input:
['1693', '9237', '7591', '1593', 'R', '6295', '9379']

Ex Output:
35788


Ex Input:
['2259', 'v', '193', '6307', '2209', 'q', '2715']

Ex Output:

13683