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:
['2577', 'B', '3059', 'S', 'l', 'T', 'Q', 'x', 'f', 'l', 'y']

Ex Output:
5636


Ex Input:
['6019', '1467', '3415', '7785']

Ex Output:
18686


Ex Input:
['4709', '8339', '7195', 't', 'z', 'j']

Ex Output:

20243