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:
['d', '6851', 'o', '5521', 'l', '3911', 'w', '1005', 'e', '3323', 'r', '7311', '4377']

Ex Output:
32299


Ex Input:
['H', 'E', 'W', '7075']

Ex Output:

7075