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:
['k', '1489', 'x', '6543', 'I', 'l', 'D', '6299', '1473', 'a', '7661', 'z', 'E', 'Z', 'U', '3671', '2873', 'e', 'p']

Ex Output:
30009


Ex Input:
['i', 'C', '5373', '2017', 'm', '5435', 'Y', 'h']

Ex Output:
12825


Ex Input:
['9121', 'N', 'Y', '3469', '8793', 'V', '5669', 't', '993', '2537']

Ex Output:

30582