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:
['g', '5301']

Ex Output:
5301


Ex Input:
['291', 'R', 'N', '983', '2879', 'C', '3797', '4837', '793', '5489', 'k', '535', 'L', '3605', 's', '3701', 'U', '4399', '2489', '4739']

Ex Output:
38537


Ex Input:
['g', '9447', 'P', '8443', '1727', 'R', 's', '4291', 'x', 'p', '1275', 'i', 'v', '6575', 'K', '21', '121', 'y']

Ex Output:

31900