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: ['D', 'G', '9895', '143', '37', 'S', '1539', 'x', 'a', 'x', 'B', 'i', '9719', '839']
Example Output: 22172

Example Input: ['m', '6721', '7861', '1853', 'E', '8163', '3717', '7053', '8625', '4949', '9865', '3685', 'Y', 't', '5593', 'b', '6529', '9087', '4181']
Example Output:
87882