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:
['251', '2155', '5029', 'k', 'j', 'I']

Ex Output:
7435


Ex Input:
['v', 't', 'a', 'r', 'O', 'I']

Ex Output:
0


Ex Input:
['P', 'p']

Ex Output:

0