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:
['1671', 'H', '9271']

Ex Output:
10942


Ex Input:
['b', '5447', 'R', '8489', 'L', '627', 'P', '7491', 'c', 'c', 'r', '6923', '1167']

Ex Output:
30144


Ex Input:
['C', 'L', '911']

Ex Output:

911