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:
['M', '6989', 'I', 'w', '3591', '3067', '3883', 'C', '6049', '5723', 'j', '5989', 'C', 'R', '475', '7779', '671']

Ex Output:
44216


Ex Input:
['J', '177', '8449', '2067', 'a', 'G', 'p', 'd', '5161', 'M', '2403', '5541', 'q', '4375', 'O']

Ex Output:
28173


Ex Input:
['a', 'U', 'C', '6875', '4659', '5067', '2853', 'N', 't', 'c', 'I', '7069', '5127', '2189']

Ex Output:

33839