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:
['q', '867', 'e', 'z']

Ex Output:
867


Ex Input:
['433', 'y', '2015', '5997', 'X', 'u', '9321', '8037', 'N', 'Z', 'E', '4645', '627', '6595', '7679']

Ex Output:
45349


Ex Input:
['x', '6951', 'z', 'c', '9507']

Ex Output:

16458