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:
['P', '6161', 'k', '5925', 'h', 'G', 'n']

Ex Output:
12086


Ex Input:
['o', 'J', 'B', '7765', '7781', '5513', '8721', 'u', '9557', 'C', 'A', '1281', '6565', 'H', '5559', '1695', '7577']

Ex Output:
62014


Ex Input:
['4131', 'T', 'x', '9493', 'j', 'w', 'L', 'w', '4627', 'E', '8239', '7317', 'z', '781', '7489', '7647', '4863', '3331', '9975', '4805']

Ex Output:

72698