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:
['J', 'm', '1255', 'S']

Ex Output:
1255


Ex Input:
['89', '5965', '9463', 'k']

Ex Output:
15517


Ex Input:
['3755', '8281', '2571', 'm']

Ex Output:

14607