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.

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

Output: 38537


Input: Consider Input: ['S', '1249', '6233', 'I', '6733', 'r', 'A', 'E', 'h', 'x', 'p', 'c', '515', '1029', '1593', '1035']

Output: 18387


Input: Consider Input: ['F', 'Q', 'P', '6501', 'l', '8825', '4263', '7433', 'A', 'a', '4277', '7229', '2457', '3367', 'f', '4823', 'g']


Output: 49175