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:
['7335', '813', '6461', '8903', '3709', 'V', 'G', 'I', 'P', 'p', 's', 'v', 'R', '4697', '4263', '9897']

Ex Output:
46078


Ex Input:
['g', 'A', 'r', '539', '5459', '2725', '7447', '3693', '1757', 'r', 'W', '5949', '4569', '5153', '3985', 'Q', '505', 'M', '8989']

Ex Output:
50770


Ex Input:
['3451', '4909', 'W', 'r', 'M', '6491', '1193', '1991', 'A', '8865', '381', '4559']

Ex Output:

31840