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:
['2765', '6767', '7645']

Ex Output:
17177


Ex Input:
['U', 'd', '893', 'h', '9679', '315', 'H', '339', '2381', '847', '7951', 'e', '9269', '9081', 'o', '6439', 'N', '4531']

Ex Output:
51725


Ex Input:
['l', '8553', '193', '5615', 'o', 'm', 'u', '3339', '233', '6837', 'a', 'i', 'h', 'P', 'X', 'E']

Ex Output:

24770