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:
['J', 'm', '1255', 'S']

Ex Output:
1255


Ex Input:
['6347', '5495', '169', '9503', 'H', '571', '6105', 'X', 'r', 'e', '7369', 'a', 'd', '6999']

Ex Output:
42558


Ex Input:
['3425', '6065', 'P', 'G', '3423', '7811', 'I', 'Y', '7601', 'J', 'f', '5557', '3859', 'W', 'I', 'r']

Ex Output:

37741