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:
['3145', 'C', '7725', 'k', 'z']

Ex Output:
10870


Ex Input:
['A', 'S', 'c', 'I', 'M', 'P', '8739', '879', '1401', '3941', '4061', 'q', 'P', '2805', '4473']

Ex Output:
26299


Ex Input:
['f', 's', 'Z', '5015', '1863', 'J', '5345', 'T', '5547', '6067', 'M', '9877', 'g', 'Q', 'O', 'M', '5003', '2623']

Ex Output:

41340