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:
['4401', 'p', 'V', 'l', 'H', '7329', 's', '4717', 'l', '1773', '67', '179', 'l', '6991', 'a', '9377']

Ex Output:
34834


Ex Input:
['k', 'a']

Ex Output:
0


Ex Input:
['c', '1953']

Ex Output:

1953