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', '6731', 'h', 'G', 'F', '6899', '4317', 'm', '9491', 'l', '971']

Ex Output:
28409


Ex Input:
['M', '6989', 'I', 'w', '3591', '3067', '3883', 'C', '6049', '5723', 'j', '5989', 'C', 'R', '475', '7779', '671']

Ex Output:
44216


Ex Input:
['d', 'u', 'm', '5821', '9987', 'H', '1781', 'x', '5883', 'n', 'z', '7263', '4355']

Ex Output:

35090