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:
['c', 'd']

Ex Output:
0


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

Ex Output:
46078


Ex Input:
['Z', 'r', 'd', '5143', 'I', '2459', '8769', 'G', 'e', '3231', '1261', 'p', '2237', 'M', '1215', '1603']

Ex Output:

25918