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:
['4177', 'd', 'b', 'm', 'f', 'R', '797', '7905', '4355', '7515', '9801', 'F', 'R', '9125', '8445', 'k', 'K', 'K']

Ex Output:
52120


Ex Input:
['r', 'B', '8791', '3165', 'n', 'm']

Ex Output:
11956


Ex Input:
['9359', 'u', 'b', 'o', 'c', 'i', '3395', 'M', 'Q']

Ex Output:

12754