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: ['a', 'j', 'v', '619', 't', 'a', '5777', 'x', 'R', 'P', '8897', 'j']
Example Output: 15293

Example Input: ['d', '6851', 'o', '5521', 'l', '3911', 'w', '1005', 'e', '3323', 'r', '7311', '4377']
Example Output: 32299

Example Input: ['4267', '1299', '6053', 'l', 'n', '3077', 'S', 'j', 'W', '7695', 'V', '615']
Example Output:
23006