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:
['5215', 'c', '839', 'V']

Ex Output:
6054


Ex Input:
['j', 'f', '3831', 'B', 'D']

Ex Output:
3831


Ex Input:
['7879', '217', 'H', '3935', 't', '9455', 'D', '8437', '2199', 'F', '6439', '3963', '8139', '2347', '1427']

Ex Output:

54437