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:
['N', 'V', 't', 'X', 't', 'M']

Ex Output:
0


Ex Input:
['z', 'T', 'Y', 's', 'j', '585', '7833', '2601', '8057', 'S', '7037', '5799', '4477', '5377', '6301', 'P', 'm', '9431', 'f']

Ex Output:
57498


Ex Input:
['S', 'Q', 'W', '1763', '3803', '1077', 'Y', 'v', '3005', 's', '4105', '7907', '9505']

Ex Output:

31165