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.

Example Input: ['83', 'k', 'p', 'o', 'b', '7819', '2089', '4141', 'c', 's', '6045', '6783', 'J', 'B', 'x', 'O', 'X', '9693']
Example Output: 36653

Example Input: ['57', '9977', '2657', 'p', '9573', '7745', '4755', 'U']
Example Output: 34764

Example Input: ['N', '5061', 'B', 'b', 'a', '3115', '7771', '7499', 'z', '1667', 'z', 'E', '8603', 'N', '7369']
Example Output:
41085