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: ['8361', '6757', '5341', '2597', '9803', 'a', 'd', '5889', '9823', 'd', '7947', 'y', 'p']
Example Output: 56518

Example Input: ['6055', 'v', '9455', 'A', '6817', 'D', '9339', 't', 'K', '1993']
Example Output: 33659

Example Input: ['3843', '7761', '8011', 'T', 'o', 'A', '3989', '3457', 'N', 'v', '6487', 'V', 'i', 'o', 'H', '9899', '5997', '2589', '2839', 'K']
Example Output:
54872

