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:
['3497', '761', '6157', 'J', 'n', '139', '9895', '2939', 'K', 'I', '2161', 'c', 'a', '485', '7959', 'i', '4753', '3305', 'G', '3475']

Ex Output:
45526


Ex Input:
['E', 'y']

Ex Output:
0


Ex Input:
['2959', '3125', '3827', '6311', '6045', 'c', '7291', 'u', '8665', '2775', '2053', 'q', 'm', '5003', 'U', 'M', 'a']

Ex Output:

48054